Massachusetts General Laws Part II. Real and Personal Property and Domestic Relations (Ch. 183-210) Ch. 209B, § 13

In any custody proceeding in the commonwealth the court shall preserve the pleadings, orders and judgments and any record that has been made of its hearings, investigations and other pertinent documents until the child reaches eighteen years of age. Upon appropriate request of the court of another state and receipt of payment therefor the court shall forward to the other court certified copies of any or all of such documents.