Section 3-408
A final order of a court of another state determining testacy, the validity or construction of a will, made in a proceeding involving notice to and an opportunity for contest by all interested persons shall be accepted as determinative by the courts of the commonwealth if it includes, or is based upon, a finding that the decedent was domiciled at death in the state where the order was made.
Comment
This section is designed to extend the effect of final orders of another jurisdiction of the United States. It should not be read to restrict the obligation of the local court to respect the judgment of another court when parties who were personally before the other court also are personally before the local court. Proof of an order of a Court of another state may be made by authenticated copy under the full faith and credit statute. If conflicting claims of domicile are made in proceedings which are commenced in different jurisdictions, Section 3-202 applies. This section is framed to apply where a formal proceeding elsewhere has been previously concluded. Hence, if a local proceeding is concluded before formal proceedings at domicile are concluded, local law will control.
Informal proceedings by which a will is probated or a personal representative is appointed are not proceedings which must be respected by a local court under either Section 3-202 or this section.
Nothing in this section bears on questions of what assets are included in a decedent's estate.
For some purposes, the law of another state may become binding in regard to due execution or revocation of wills controlling local land, and to questions concerning the meaning of ambiguous words in wills involving local land. But, choice of law rules frequently produce a similar result. See § 240 Restatement of the Law, Second: Conflict of Laws, p. 73, Proposed Official Draft III, 1969.
This section may be easier to justify than familiar choice of law rules, for its petition is limited to instances where the protesting party has had notice of, and an opportunity to participate in, previous litigation resolving the question the protesting party now seeks to raise.