Massachusetts General Laws Part II. Real and Personal Property and Domestic Relations (Ch. 183-210) Ch. 190B, § 2-114

(a) Except as provided in subsection (b), for purposes of intestate succession by, through, or from a person, an individual is the child of his natural parents, regardless of their marital status. The parent and child relationship may be established under applicable state law.

(b) An adopted individual is the child of his adopting parent or parents and not of his natural parents, but adoption of a child by the spouse of either natural parent has no effect on the right of the child or a descendant of the child to inherit from or through either natural parent. The court may decree that the rights of succession to property under this section, or under former section 7 of chapter 210, shall vest in an adopted individual as of the date of the filing of the petition for adoption.

(c) No adopted individual shall, by being adopted by any person related by consanguinity to the adopted individual, lose their right to inherit from their natural parents or kindred.