Short answer. No. Rule 76, Section 2 states directly that no defect in the petition shall render void the allowance of the will, or the issuance of letters testamentary or of administration with the will annexed. Mistakes or missing details in the petition itself do not void the probate outcome.
What the law says
But no defect in the petition shall render void the allowance of the will, or the issuance of letters testamentary or of administration with the will annexed.
Rule 76, Section 2 — Contents of petition. Read the full provision →
What the petition is supposed to contain
Rule 76, Section 2 lists what a petition for the allowance of a will must show, so far as known to the petitioner: the jurisdictional facts, the names, ages, and residences of the heirs, legatees, and devisees, the probable value and character of the estate's property, the name of the person for whom letters are prayed, and, if the will has not been delivered to the court, the name of the person holding it. That qualifying phrase, so far as known, already signals that the rule does not expect the petition to be flawless or complete on every detail from the outset.
The safeguard against a defective petition
The same section then adds the protection that answers your question directly: but no defect in the petition shall render void the allowance of the will, or the issuance of letters testamentary or of administration with the will annexed. A mistake or an omission in what the petition states does not travel forward to poison the eventual outcome. The allowance of the will and the issuance of letters remain valid even where the petition that started the case had defects in it.
Why the rule is written this way
This safeguard exists because the petition is the starting document in a proceeding, not the final word on the estate's facts, and much of what it requires, such as the ages and residences of heirs or the probable value of the estate, may genuinely not be fully known to the petitioner at the time of filing. Tying the validity of the eventual probate to the accuracy of that initial filing would let clerical errors or incomplete information at the outset undo a proceeding that otherwise ran its proper course, which is exactly what this provision is written to prevent.
What this safeguard does not do
This protection covers defects in the petition itself, not every possible problem that could arise in a probate proceeding. It does not mean interested parties lose the chance to raise real objections to the will, contest the facts once they come to light, or challenge whether the will was validly executed; those substantive issues are addressed through the ordinary course of the proceeding rather than through the petition's initial wording. The rule simply prevents a petition's own imperfections, such as incomplete details the petitioner could not yet fully know, from later being used to undo a probate that proceeded properly on the merits.