Proceedings under sections eighteen and twenty-one, if the spouse of such a person who is incapacitated by reason of mental illness is an inhabitant of the commonwealth, shall be in the county where said spouse resides, otherwise in a county where any of said spouse's real estate is situated, and a certified copy of all final orders or decrees in such proceedings shall be recorded in the registry of deeds in every county or district where such real estate lies.
Massachusetts Legal Code