John Robert Greener (John) and his wife Cecile M. Greener (Cecile) executed the same document as their will on July 11, 1961. The will was prepared by a lawyer, the effect of which preparation, rather than being helpful to us and the other courts to which the resulting problems have been presented, only makes us sigh. We set the will out in full, except for the attestation clause, with the portions giving rise to the controversy italicized.
LAST WILL AND TESTAMENT
KNOW ALL . MEN BY THESE PRESENTS that we, JOHN ROBERT GREENER and CECILE M. GREENER, husband and wife, residing in Springfield, Missouri, being of sound and disposing mind and memory, do make, publish, and declare this our last will and testament, hereby revoking and making null and void all other last wills and testaments and codicils thereto by us made heretofore.
ITEM I: We declare that all our just debts and funeral expenses shall first be paid from our estate.
ITEM II: All of our property of any kind and character is at the present time so arranged that it will pass unto the other party in the event of the death of one of the parties herein. Therefore, the purpose of this will is to devise and bequeath the property of the parties in the event of a common disaster to both John Robert Greener and Cecile M. Greener.
ITEM III: In the event that by reason of a common disaster or calamity both of us should fail to survive, then in that event from the proceeds of our insurance policies, we hereby will and bequeath unto Kathleen Konz the sum of Five Thousand Dollars ($5,000.00) and unto Louis Konz the sum of Five Thousand Dollars ($5,000.00); and it is further directed said money shall be placed in trust for said Kathleen Konz and Louis Konz in the Union National Bank of Springfield, Missouri. It is further directed that the Union National Bank of Springfield, Missouri, shall hold said money in trust until the time that each child shall start his college education, and if either Kathleen Konz or Louis Konz shall wish to go to college, said money shall be used for their further education. However, in the event either one of them does not want to go to college, at the time each child reaches the age of twenty-one (21), the trust shall terminate and said money shall be paid over to each of them.
ITEM IV: We further will and bequeath in the event of a common disaster, to C.E. Greener the sum of Twelve Hundred Dollars ($1,200.00) in cash to be taken from the estate.
ITEM V: We further will and bequeath in the event of a common disaster, the following personal effects of Cecile M. Greener to her sister, Mrs. Marge Voss of Appleton, Wisconsin, all of the jewelry, *740furs, clothing, and silver owned by Cecile M. Greener at the time of her death.
ITEM VI: We hereby will and bequeath unto Lee James Konz the sum of One Dollar ($1.00).
ITEM VII: We further will and bequeath all the rest and residue of our property, real, personal, or mixed, to be divided into equal third parts and to be distributed as follows: One-third (%) shall go to C.E. Greener; One-third (Vs) shall go to Mrs. Marge Voss; and One-third (M>) shall go to the Immaculate Conception Church of Springfield, Missouri.
ITEM VIII: We hereby appoint E.W. Collinson executor of this our last will and testament and direct that said executor shall have the power to immediately sell any real and personal property not specifically bequeathed in this will and reduce the same to cash as after the inventory is filed that said executor deems necessary.
IN WITNESS WHEREOF, we have hereunto set our hands and seals this 11th day of July, 1961.
/s/ John Robert Greener
John Robert Greener
/s/ Cecile M. Greener
Cecile M. Greener
C.E. Greener was John’s brother. He died before either of the testators, in 1970 or 1971. Marge Voss, a sister of Cecile Greener, is still living and is one of the defendants. Lee James Konz is an adopted son of Cecile, but not of John. He survives and is also a defendant. The persons described in the will as Kathleen Konz and Louis Konz are children of Lee James Konz. They are now known as Catherine M. Hel-mer and Louis P. Greener and are the plaintiff-contestants. They were adopted by John and Cecile, in August of 1962, after the making of the will in issue.
Cecile died on October 10,1979 of a heart attack. John survived only two and one-half months, dying on December 30, 1979, also of a heart attack. The deaths bore no relation to each other and were not the result of a common disaster. The record shows no attempt to offer the will for probate as the will of Cecile, and no evidence that any administration was had on her estate. If indeed the property of the testators was held in joint names, or in estate by the entireties, it is very possible that no administration on her estate was necessary. The will was admitted to probate as the will of John.
Catherine M. Helmer and Louis P. Greener filed a suit to contest the will as the will of John. Their spouses were later joined as plaintiffs, for unexplained reasons. The will contest is unusual in that there is no claim that the will was not executed with statutory formalities, and no issue of testamentary capacity or undue influence. The claim rather is that the will, by its very terms, was totally inoperative inasmuch as John and Cecile did not die in a common accident. There is ample authority that a claim of this kind may be raised in a will contest.1 If the contest should be successful, the contestants would inherit John’s property by showing that they are his children by adoption.2 There is no evidence that John had any other children, natural or adopted, or that Cecile, who had been married before, had children other than her adopted son Lee James Konz.
There is no very strong evidence about the nature and extent of the property of John and Cecile in 1961. The attorney who drafted the will testified that they owned a home with some equity but probably with substantial mortgage indebtedness. He knew of no stocks or bonds. There were two life insurance policies, apparently on John’s life, for $5,000 each, which are men*741tioned in Item III. The inventory value of John’s estate was approximately $94,000. The record is silent as to how his assets were acquired, as to the portion acquired after 1961, and as to whether all substantial assets had been held jointly with Cecile. The attorney who drew the will testified that, in 1961, “both had good jobs” and appeared to live well, and it may be inferred that they expected to add to their total assets.
At a bench trial the defendants, proponents of the will, sought to introduce other evidence which they felt was probative of the intention of John and Cecile that the will remain operative as to the property of the survivor after the unrelated death of the other. Most of this evidence was received over the objection of counsel for the contestants, who have consistently claimed that the will is unambiguous and that extrinsic evidence is not admissible as an aid to construction. The trial judge prepared an extensive Memorandum Opinion in support of his decision, concluding that the will was intended to have effect only in the event that John and Cecile should die in a common disaster, and that, since this did not occur, it was totally ineffective for any purpose. He first analyzed the case without considering the evidence to which objection had been made, and then did so on the basis of all evidence offered, reaching the same result in both instances. We have found his Memorandum Opinion helpful and commend his method for complicated or unusual cases.3 We, however, do not agree with his disposition of the case, as a matter of law.
The Missouri Court of Appeals, by 2 to 1 vote, reversed the judgment of the trial court. We transferred the case on motion. We make extensive use of Judge Flanigan’s research and at times of his phraseology, as set forth in his majority opinion.
The contestants, to succeed, must demonstrate that the will as written was of absolutely no effect because it was subject to an express condition which did not occur. If the will has any effect at all it may not be set aside in this will contest action, in which the competency of the testators and the due execution is not challenged.
The will as we examine it presents several problems. It is, in the first place, the will of two persons, and this is unconventional but by no means unprecedented. Item II indicated a purpose or occasion for executing a will and, standing alone, might possibly suggest that the entire will was designed to be effective only if the two testators perished in a common disaster. Express common disaster conditions are set out in Items III, IV and V, but they do not appear in Items I, VI, VII and VIII. This raises a question as to what the testators had in mind when they included the provisions in some paragraphs but not others.
We agree generally with the contestants that the questions presented must be solved within the four corners of the will, and that extrinsic evidence as to what the testators may have intended is not admissible. The law draws a distinction between latent and patent ambiguities. The problems presented by this will are patent — that is, apparent to a person who reads the entire document with care. It is not inappropriate to resort to outside evidence of surrounding circumstances to identify the beneficiaries, to explain their relationship to the testators, or to show the nature and extent of the testators’ holdings. When such explanatory material has been obtained, however, we must look primarily to the language of the will. These propositions are stated clearly in Breckner v. Prestwood, 600 S.W.2d 52, 55 (Mo.App. 1980), with citation of other cases.
Counsel have pointed to quite a few cases in which a testator has expressed a purpose or occasion for making a will, or has specified conditions to the effectiveness of the entire will or some part of it. The condi*742tions often relate to death in a common disaster. These cases are helpful but, in the final analysis, we must depend on our analysis of the particular will before us. We reach our conclusion almost entirely on the basis of our reading of the will. Factual matters play a very small part. When the factual disputes are minimal, furthermore, an appellate court is as capable of interpreting and construing a written instrument as is the trial court.4
It is perfectly possible to execute a will which has no effect at all unless a specified condition is performed or occurs. If such a condition is expressed, it will be enforced. Robnett, supra. Unless the language is compelling, however, courts hesitate to construe language of purpose or occasion for making a will as establishing a condition precedent to the very effectiveness of the will.5 Courts, furthermore, are disposed to adopt any reasonable construction which will avoid intestacy.6
Turning to the will at hand, Item II does not say in so many words that the document is to be totally ineffective only if John and Cecile die in a common disaster. If this were the intention, it could be expressed much more clearly. The language may well be interpreted as stating a purpose rather than as establishing a condition.
The contestants argue that the repetition of the language of condition in Items III, IV and V reinforces their argument that the entire will was intended to be conditional on the death of both testators in a common disaster. This circumstance, however, strongly supports the opposite position. Inasmuch as Items I, VI, VII and VIII contain no conditional language, the only reasonable conclusion is that the testators intended that these clauses be treated in a manner different from the conditional clauses. The different treatment, coupled with the lack of a positive command in Item II, persuade us that the testators intended that the unconditional clauses remain effective, so that the will may be probated as the will of the survivor. It is not for us to speculate as to why the testators made some clauses of the will conditional and others unconditional, once our task of construction is performed.
The trial court cited Robnett in support of its finding for contestants, and Judge Greene mentioned the case in his dissenting opinion in the Court of Appeals. In Rob-nett, however, the expressed condition appeared just before the only substantial dis-positive clause, and the court found that the condition governed the entire will. The Robnett opinion cited an earlier Massachusetts case, Damon v. Damon, 8 Allen (90 Mass.) 192 (1864), in which a purpose of protecting against possible mishaps during a trip to Cuba was mentioned at the beginning of a will and an express condition was attached to one paragraph of a will but not to the other two paragraphs. 49 Mo. at 174-175. The Damon court held that the later clauses were not conditional and that the will was properly admitted to probate. We believe that that case is closer to the present situation than is Robnett.
The contestants also rely on a more recent Missouri case, Gehring v. Henry, 332 5.W.2d 873 (Mo.1960), in which the court inserted a period where some punctuation *743was needed in the process of construing a joint will and found that one bequest was conditional. This case is not helpful to them because the condition was attached only to the single bequest in question, and the will contained mutual and unconditional bequests by the spouses in favor of each other.
The contestants argue that the court must either give effect to all clauses of the will, or to no part of it. This is wide of the mark. The court may give effect to unconditional bequests, while holding that conditional bequests fail if the condition on which they depend is not established. Such a holding would be strictly in accordance with the language of the will and would give effect to all terms as they are written. Pew wills of any length do not contain some conditional bequests. We observe that the conditional items in III, IV and V are bequests of sums of money or specific property and that if they were to fail there would still be a complete testamentary scheme. Item VI operated to disinherit Cecile’s son Lee James Konz, who would take her entire estate if she were to survive and were to die intestate, and who would have a possible statutory claim under § 474.240, RSMo, if not mentioned in her will. Item VII is a general residuary clause of a type which is common among childless couples. One-third of the residue is left to John’s brother, one-third to Cecile’s sister, and one-third to charity. There would be no partial intestacy if Items III, IV and V were not given effect.
It would also be unusual, if Cecile did not want her son to have any part of her property, for her to make a will in which he would get only $1.00 if she and John were to die in a common disaster, but all her property if she were to survive John only to die herself in short order from a cause unrelated to his death.
The contestants and the trial judge make much of the use of “we” in all of the items, including the unconditional ones. This circumstance is not of great significance. As we have observed, it is perfectly possible, though unusual, for two people to make their wills in the same document. There is much learning about “joint and mutual wills,” most of which has no significance in this case. One possibility, recognized by the trial court, is that the will was intended to be contractual, with John and Cecile agreeing with each other that the survivor would not alter the will. The judge properly observed that no issue on this point was present in the case, inasmuch as John did not try to alter or to revoke the will after Cecile died. Those who choose to use the joint form of testation, however, might very probably use the word “we” in all the bequests without detracting from the effectiveness of the document as the separate will of each testator.
It would be just as improper to consider subsequent events in construing this will as it would be to consider extrinsic evidence of the testators’ intentions. See 4 Page on Wills, Bowe-Parker Revision, § 30.7 (1960); In re Estate of Graves, 203 Kan. 762, 457 P.2d 71 (1969). The will continues in effect until modified or revoked. People often procrastinate even though circumstances change and new wills should be made. The law provides for certain circumstances which operate to modify or annul existing wills. In other situations a will, once executed, remains in effect until revoked by one of the methods prescribed by law. The subsequent adoption of Catherine Helmer and Louis Greener may not be considered in construing the will before us. We have no occasion to express any opinion about the rights they might establish under § 474.240, RSMo (1982 Supp.).7 Nor is the subsequent death of John’s brother, C.E. Greener, after the will was executed but long before John and Cecile died, a matter which may be considered in construing their will. We also have no reason to probe the effect under § 474.460, RSMo (1982 Supp.) of the death of a person to whom a fraction of the residue has been bequeathed.
The dissenting opinion argues that an invalidating condition which permeates the *744entire will was “conclusively established” in Item II and that no further construction is necessary or permissible. Legion cases hold that a will must be construed in its entirety and recognize the possibility that a will may contain provisions which are at war with each other, so that all cannot be given full effect. See, e.g., First National Bank of Kansas City v. Stevenson, 293 S.W.2d 362 (Mo.1956); Scott v. Fulkerson, 332 Mo. 734, 60 S.W.2d 34 (1933). Although we do not believe that Item II is so clear as the dissent would have it, we believe that our conclusion is sound even if it be considered that there is a flat repugnancy.
We conclude that Item II did not have the effect of making the entire will conditional on the death of the testators in a common disaster. The judgment is therefore reversed and the case is remanded to the Circuit Court of Greene County with instructions to declare that the will in issue is the last will and testament of John Greener.
RENDLEN, C.J., and GUNN and BILLINGS, JJ., concur. WELLIVER and HIGGINS, JJ., dissent in separate opinions filed. DONNELLY, J., dissents and concurs in separate dissenting opinion of HIGGINS, J.. Robnett v. Ashlock, 49 Mo. 171 (1872); Eaton v. Brown, 193 U.S. 411, 24 S.Ct. 487, 48 L.Ed. 730 (1904); Bagnall v. Bagnall, 148 Tex. 423, 225 S.W.2d 401 (Tex.1949); 79 Am.Jur.2d Wilts, § 751 (1975).
. The trial judge said that some of the parties disputed the validity of the adoption decree, and properly noted that no issue of its validity was before him. Nor is the issue before us. This case involves only the existence of a will, and not distribution.
. If judges will follow this practice in future court-tried cases, it will often be possible for the appellate court to dispose of a case finally on the basis of the trial judge’s weighing of the evidence, without the need for possibly imperfect fact finding at the appellate level, or for a remand to permit the trial court to find additional facts.
. See Willis v. Robinson, 291 Mo. 650, 678, 237 S.W. 1030, 1037 (1922); and also opinion of Gunn, P.J., in Zaharopoulos v. Sprenger, 605 S.W.2d 143, 146 (Mo.App.1980), holding that the rule of Murphy v. Carron, 536 S.W.2d 30 (Mo. banc 1976), has no application to this situation.
. Vaught v. Vaught, 247 Ark. 52, 444 S.W.2d 104, 106 (Ark. 1969); in re Taylor’s Estate, 119 Cal.App.2d 574, 259 P.2d 1014, 1018 (Cal.App. 1953); In re Trager’s Estate, 413 Ill. 364, 108 N.E.2d 908, 910 (111.1952); Warren v. Hartnett, 561 S.W.2d 860, 862 (Tex.Civ.App.1977); Matter of Estate of Gardner, 615 P.2d 1215, 1217 (Utah 1980); Mason v. Mason, 268 S.E.2d 67 (W.Va.1980); 79 Am.Jur.2d Wills § 745 (1975); 94 C.J.S. Wills § 152 (1956); Annot., 1 A.L. R.3d 1048; 1 Page on Wills, Bowe-Parker Revision, § 9.5 (1960).
. Wood v. Greimann, 165 F.2d 637, 638 (9th Cir.1948); In re Trager’s Estate, 413 Ill. 364, 108 N.E.2d 908, 910 (Ill. 1952); Warren v. Hartnett, 561 S.W.2d 860, 862 (Tex.Civ.App.1977); Matter of Estate of Gardner, 615 P.2d 1215, 1217 (Utah 1980); Mason v. Mason, 268 S.E.2d 67, 68 (W.Va. 1980).
. Note 2, supra.