Massachusetts General Laws Part II. Real and Personal Property and Domestic Relations (Ch. 183-210) Ch. 183, § 5A

A statement of a person's married or unmarried status, kinship or lack of kinship, or of the date of his birth or death, which relates or purports to relate to the title to land and is sworn to before any officer authorized by law to administer oaths may be filed for record and shall be recorded in the registry of deeds for the county where the land or any part thereof lies. Any such statement, if so recorded, or a certified copy of the record thereof, in so far as the facts stated therein bear on the title to land, shall be admissible in evidence in support of such title in any court in the commonwealth in proceedings relating to such title.