1. The appellant contends that the allegations in the first cause of suit do not comply with the rule that the complaint, in cases of this kind, should distinctly show what was the original agreement of the parties, and should point out with clearness and precision wherein there was a mistake, and should show that the mistake did not arise from the gross negligence of the plaintiff: Lewis v. Lewis, 5 Or. 170, 177. The complaint does distinctly show what was the original agreement and it also points out precisely wherein there was a mistake. A demurrer to the first cause of suit might have required the plaintiff to give a more specific explanation of his own conduct in order sufficiently to show that the mistake did not arise from his own gross negligence. There is not, however, a complete absence of allegations concerning the lack of negligence on the part of the plaintiff, and at th,e'most the only criticism that can be made of the averments in the complaint is that it contains a defective statement of a good cause of suit; and consequently when the objection is for the first time urged on the hearing in this court “every reasonable inference should be given in favor of the complaint that can be drawn therefrom”: Hyland v. Hyland, 19 Or. 51, 58 (23 Pac. *597811, 814); Osborn v. Ketchum, 25 Or. 352, 357 (35 Pac. 972).
2. It is argued that by failing to reply the plaintiff admitted the appellant’s claim. Following the words “this defendant admits and alleges” are affirmative statements which in form are new matter but in substance amount merely to denials; and hence a reply was not necessary: Kabat v. Moore, 48 Or. 191, 195 (85 Pac. 506); 31 Cyc. 244.
3. The plaintiff maintained an office in Portland. Katherine Yreeland, the daughter of plaintiff, and George Yreeland had been married in July, 1911, and we infer from the record that they lived in or near Hood River. Welch owned an “equity” in a tract of land in the Hood River valley. Soon after the Vreelands purchased the Johnson land they expressed a desire to secure the tract in which Welch owned an “equity”'; and according to the testimony of Welch “they suggested they would like to turn in their equity in this place, and as she was my daughter I told her I would take that equity, the equity in the piece of property in the Hood River orchard lands for the piece they desired.” In the language of George Yreeland, the parties “just switched equities.” A. Welch, George Yreeland and Katherine Yreeland all testified in positive terms that they agreed to exchange equities and that there was no agreement that Welch should assume the payment of the note and mortgage held by Johnson. Welch and the Yreelands were the only persons who had actual knowledge of the terms of the agreement. No witnesses testified that Welch agreed to pay the note or to procure a release of the mortgage. The only evidence contradicting the story told by Welch and the Yreelands consists of alleged suspicious circumstances including the relationship between *598Welch and the Vreelands, the assumption clause in the deed from Welch to the Pacific Land 'Company, and the like. It must be remembered that this is not a case where the grantee is asserting and the grantors are denying that there was a mistake; but here not only the grantee but also the grantors are unreservedly agreed’that a mistake was made in the preparation of the deed. The fact that all the persons who knew about the terms of the agreement testified that there was a mistake made in the preparation of the deed, and there was no evidence to the contrary except a few suspicious circumstances, and the fact that the trial judge saw and heard the witnesses, and on that account was in a better position to pass upon the credibility of those witnesses, present a situation where the findings of the trial judge are peculiarly entitled to respect; and we therefore conclude that the findings of the trial judge concerning the fact of mistake should remain undisturbed: Tucker v. Kirkpatrick, 86 Or. 677, 679 (169 Pac. 117); Rowe v. Freeman, 89 Or. 428, 435 (172 Pac. 508, 174 Pac. 727).
4. The deed which the plaintiff seeks to have reformed was prepared in his office by his stenographer. Welch testified that when the Vreelands said that “they wanted the other place” he “told them all right. They said fix up the deed and send up to them.” Continuing his testimony Welch stated, “I had my stenographer prepare a deed for an equity in a certain piece of property. It was sent up there and signed and put on record in Hood Eiver County.” When asked whether the clauses concerning the assumptioh of the mortgage were inserted in the deed by his authority or with his knowledge he answered: “They were not. They were inserted there by copying a deed.” *599Although Welch stated that he had no recollection of having seen the deed from the Ricords to Katherine Yreeland, nevertheless if the presence of the assumption clause in the deed to Welch is to be accounted for by saying that it was “inserted there by copying a deed,” the reasonable inference is that the stenographer had the deed which the Ricords gave to Katherine Yreeland. At any rate the testimony of Welch is to the effect that the paper was prepared by his stenographer upon his instruction to “prepare a deed for an equity in a certain piece of property,” and presumably the stenographer had in her possession and copied from the deed which the Ricords had made. After the paper had been prepared by the stenographer it was forwarded to the Vreelands at Hood River and they appeared before a notary public on November 7, 1912, and signed and acknowledged the instrument. George Vreeland caused the deed to be recorded on November 9,1912, and at some subsequent time he returned it to Welch. On December 28, 1916, Welch received a letter from the attorney for Johnson, advising him that Johnson had obtained a decree against the Pacific Land Company “foreclosing the mortgage on the property [describing it] which together with the note you assumed and agreed to pay in the deed given to you by your daughter, * * on November 7,1912,” and saying also that “you are personally responsible for the payment of this claim in full” and “that Mr. Johnson looks to you for payment of this indebtedness.” According to the testimony of Welch he did not know of the existence of the assumption provision in the deed prior to the receipt of that letter. George Yreeland did not knoy, when he signed the deed, that the document contained the assumption provision; and Katherine Yreeland said in substance *600that she supposed that the deed merely transferred the equity. Welch did not ask for or receive an abstract of title.
It is not surprising that Welch did not ask for an abstract or that the Vreelands did not read or notice the assumption provision in the deed signed by them because in the language of George Vreeland “it was a family agreement.” If, as the trial court expressly found, the assumption clause was inserted in the paper “by and through a mistake or oversight of'the scrivener, and without the knowledge or consent of either the grantor or grantee,” Welch is entitled to a reformation of the deed and Johnson cannot avail himself of the assumption clause: Bradshaw v. Provident Trust Co., 81 Or. 55, 62 (158 Pac. 274); Lloyd v. Lowe (Colo.), 165 Pac. 609 (L. R. A. 1918A, 999); Parchen v. Chessman, 53 Mont. 430 (164 Pac. 531).
5. The appellant argues that Welch was negligent and on that account cannot ask for a reformation of the deed. It is true that, stated in broad terms, the rule is that equity will not relieve a person from his erroneous acts or omissions resulting from his own negligence (2 Pom. Eq. Juris. (3 ed.), § 839); and yet as pointed out by Professor Pomeroy in his legal classic it is not c'orrect to say that a mistake resulting from the complaining party’s own negligence will never be relieved, but—
“It would be more accurate to say that where the mistake is wholly caused by the want of that care and diligence in the transaction which should be used by every person of reasonable prudence, and the absence of which would be a violation of legal duty, a court of equity will not interpose its relief; but even with this more guarded mode of statement, each instance of negligence must depend to a great extent upon its own circumstances. It is not every negligence that will *601stay the hand of the court. The conclusion from the best authorities seems to be, that the neglect must amount to the violation of a positive legal duty. The highest possible care is not demanded. Even a clearly established negligence may not of itself be a sufficient ground for refusing relief, if it appears that the other party has not been prejudiced thereby. In addition to the two foregoing requisites, it has been said that equity would never give any relief from a mistake, if the party could by reasonable diligence have ascertained the real facts; nor where the means of information are open to both parties and no confidence is reposed; nor unless the other party was under some obligation to disclose the facts known to himself, and concealed them. A moment’s reflection will clearly show that these rules cannot possibly apply to all instances of mistake, and furnish the prerequisites for ■all species of relief. Their operation is, indeed, quite narrow; it is confined to the single relief of cancellation, and even then it is restricted to certain special kinds of agreements”: 2 Pom. Eq. Juris. (3 ed.), § 856.
The principle discussed by Professor Pomeroy was recognized and approved in Howard v. Tettelbaum, 61 Or. 144, 149 (120 Pac. 373), where it is said:
“Negligence, in order to bar equitable relief, in case of mutual mistake, clearly established, must be so gross and inexcusable as to amount to a positive violation of a legal duty on the part of the complaining party.”
See, also: 34 Cyc. 949.
But, repeating the language of Professor Pomeroy, “each instance of negligence must depend to a great extent upon its own circumstances.” To the same effect are: Powell v. Heisler, 16 Or. 412, 416 (19 Pac. 109); Farwell v. Home Ins. Co., 136 Fed. 93, 98 (68 C. C. A. 557); Shields v. Mongollon Exploration Co., 137 Fed. 539, 550 (70 C. C. A. 123). Nor is the failure of a complainant to read an instrument conclusive evi*602dence, as a matter of law, that the mistake was due to his negligence: West v. Suda, 69 Conn. 60, 62 (36 Atl. 1015); Hitchins v. Pettingill, 58 N. H. 3; Bradshaw v. Provident Trust Co., 81 Or. 55, 59 (158 Pac. 274); Lloyd v. Lowe (Colo.), 165 Pac. 609, 610 (L. R. A. 1918A, 999); 6 Pom. Eq. Juris., § 680. See, also: Albany City Savings Inst. v. Burdick, 87 N. Y. 40; Story v. Gammell, 68 Neb. 709 (94 N. W. 982); Taylor v. Glens Falls Ins. Co., 44 Fla. 273 (32 South. 887).
The record does not present any element of estoppel as between Johnson and Welch. If instead of being the mortgagee Johnson were an assignee of the mortgagee, and had purchased the mortgage after the delivery of the deed to Welch on the faith of the added security afforded by the assumption clause, or, if Johnson had changed his position to his disadvantage by reason of the assumption provision in the deed to Welch, quite a different case would confront us: International Mortgage Bank v. Matthews, 92 Wash. 180 (158 Pac. 991). Johnson paid nothing on account of the assumption clause; he neither did nor omitted to do any act on account of it; and, so far as he is concerned and for all practical purposes, any advantages reaped from it by him are gratuitous. We conclude from the circumstances disclosed by the record, and especially in view of the fact that the grantors and grantee named in the deed agree that there was a mistake as alleged by the complainant and in view of the further fact that there is no element of estoppel available to Johnson, that Welch was not guilty of such negligence as will prevent a reformation of the deed: Stone v. Moody, 41 Wash. 680 (84 Pac. 617, 85 Pac. 346, 5 L. R. A. (N. S.) 799).
6. The Yreelands had, by the assumption clause in the deed from the Eicords, obligated themselves to pay *603the note and mortgage; and they were therefore vitally interested in any change that might be made in the deed to Welch: Stover v. Tompkins, 34 Neb. 465 (51 N. W. 1040).
The Vreeland's were necessary parties and ought to have been served with, summons and complaint so that any decree which might be rendered would bind them as well as Johnson and Welch. All the parties to a deed who are affected immediately or consequentially by a mistake should be made parties as they are entitled to be heard upon any matter that might affect their rights under the decree: Center Creek Water & Irr. Co. v. Lindsay, 21 Utah, 192 (60 Pac. 559); First National Bank v. Fessler, 84 N. J. Eq. 166 (92 Atl. 914); Taylor v. Holmes (C. C.), 14 Fed. 498, 514; Cole v. Fickett, 95 Me. 265, 269 (49 Atl. 1066); Hellman v. Schneider, 75 Ill. 422, 425; De Groot v. Wright, 9 N. J. Eq. 55, 58; Oliver v. Clifton, 59 Ark. 187, 190 (26 S. W. 817); Bonvillain v. Bodenheimer, 117 La. 794, 815 (42 South. 273).
The facts here are unlike the facts in Beasley v. Shively, 20 Or. 508 (26 Pac. 846), and hence we would not be justified here in dismissing the suit as was done there. Nor need we remand the cause with general directions or with special directions like those given in Mangin v. Kellogg, 22 Ida. 137 (124 Pac. 651, 653). Katherine Vreeland and George Vreeland appeared as witnesses for Welch and as such witnesses testified that Welch did not agree to assume the note and mortgage and that the assumption provision was inserted in the deed to Welch through a mistake. This testimony, given by the Vreelands, estops them from denying Welch’s right to a reformation of the deed and dispenses with the necessity of remanding the cause: Vial v. Norwich Fire Ins. Society, 172 Ill. App. 134, 140; *604affirmed in 257 Ill. 355 (100 N. E. 929, Ann. Cas. 1914A, 1141, 44 L. R. A. (N. S.) 317); Gardner v. Kinney, 60 Or. 292, 296 (117 Pac. 971). See, also: De Vol v. Citizens’ Bank, 92 Or. 606 (181 Pac. 985).
On petition for rehearing. Department 1. Denied. Mr. Ernest G. Smith and Messrs. Huntington & Wilson, for the petition. Mr. W. A. Bobbins, contra.The decree appealed from is affirmed.
Affirmed.
McBride, C. J., and Burnett and Bean, JJ.} concur.