Massachusetts General Laws Part II. Real and Personal Property and Domestic Relations (Ch. 183-210) Ch. 190B, § 5-405

(a) On a petition for appointment of a conservator or other protective order, the requirements for notice described in section 5-304 apply, but (i) if the person to be protected has disappeared or is otherwise situated so as to make personal service of notice impracticable, notice to the person shall be given by leaving a copy of the petition and citation at the last and usual place of abode of the person to be protected, and (ii) if the person to be protected is a minor, the provisions of section 5-206(b) also apply.

(b) Notice of hearing on a petition for an order subsequent to appointment of a conservator or other protective order shall be given to the protected person, any conservator of the protected person's estate, and any other person as ordered by the court.