The respondents’ final account as administrators de bonis non with the will annexed of Edmund M. Wood was allowed by decree of the court of probate June 24, 1919, and upon their resignation accepted by the court, the petitioner, appointed May 13, 1920, brought on May 14, 1920, a petition for revocation of the decree. The grounds alleged are: that an item in the account relating to the sale of certain shares of stock forming a substantial part of the estate was false, and the allowance of the account" was fraudulently procured, and also that no guardian ad litem had been appointed to represent the interests of persons unborn who might be entitled under the testator’s will to share in the trust fund. The trial, however, was limited to the second issue, and a decree of revocation having been entered the case is here on the respondents’ appeal.
The first article of the will appoints trustees to whom by the fifth article is given “two thirds of the residue of my property in trust to hold and safely invest the same and of the net income thereof to pay one quarter to my wife and one quarter to each of my three children during their joint lives. Upon the death of my wife or upon the death of either of my children leaving no issue or if either my wife or any child of mine leaving no issue shall have died before me I direct my trustees to divide the said net income equally among the survivors of my wife and my children as long as any of them shall live provided however,, that either of my children by will made either before or after my death may appoint the share of my estate which under this article he or she if surviving would have been entitled to receive the income to such person or persons and upon such trusts as he or she shall see fit and my executors or trustees shall transfer convey and pay over such share of the principal trust fund upon my death if such child shall not survive me otherwise upon such childs death according to such appointment but if either of my children whether before or after my death shall die leaving issue surviving and without having made such appointment the share of income which such child if living would from time to time have taken sha.11 be paid to such issue Upon the death of the last survivor of my wife and children if there shall be issue of more than one of my children then surviving I direct that the principal of the fund then held in trust not otherwise appointed as hereinbefore *320provided including any undivided accumulation of income shall be divided among the issue of my children and paid over transferred or conveyed accordingly but if at the time of such last survivor’s death there shall be issue of only one of my children surviving I direct that the whole principal not otherwise appointed shall be paid to the said issue In every case where under this or any of the articles of my will a gift is made to issue such issue shall take according to the stock and not per capita and the words 'net income’ wherever used shall be construed to mean the income after deducting all proper expenses and charges of administering the trust.”
It is contended by the respondents that all the living heirs or persons interested in the estate having assented,■ the final decree cannot be vacated. But a valid testamentary trust had been created which had not been terminated, and under which unless there was an absolute failure of issue of his children, the principal at the death of his widow and the last surviving child is to be divided among the issue of “my children” or “if there shall be issue of more than one of my children then surviving . . . the whole principal not otherwise appointed shall be paid to the said issue.” Conant v. St. John, 233 Mass. 547. It is manifest that, even if all the children and grandchildren were living at the date of the allowance of the account, the contingency of the birth of a grandchild or grandchildren is not shown by the record to be an event which in the efflux of time could not occur. It was therefore necessary that the interests of unborn grandchildren should be represented by a guardian ad litem before the account could lawfully be allowed. R. L. c. 150, § 22 (see now G. L. c. 206, § 24). Neafsey v. Chincholo, 225 Mass. 12.
The decree being invalid, the estate has not been fully settled and administered by the respondents, and the amount of the trust fund if any ascertained. The petitioner whose appointment as administrator de bonis non with the will annexed is not open to collateral attack, can maintain the petition as part of his official duties necessarily connected with the settlement of the estate. Connors v. Cunard Steamship Co. Ltd. 204 Mass. 310. Blake v. Dexter, 12 Cush. 559, 569.
It is contended that the petition was filed too late, and R. L. c, 150, § 17, as amended by St. 1907, c. 438, § 1 (see now G. L. *321c. 206, § 19), is cited. But the statutory limitation of six months within which a petition must be filed for the reopening of an account which has been allowed in the absence of parties interested is inapplicable where those who may be affected are not in being. The statute was intended to apply only to those persons who by appropriate action could protect their rights by opposing the allowance of an account of an executor, administrator, guardian, conservator or trustee. See Renwick v. Macomber, 233 Mass. 530.
The requests in so far as argued were denied rightly and the decree revoking the decree of June 24, 1919, and ordering the account of the respondents to stand for further hearing should be affirmed.
So ordered.