20 Pa.C.S. § 3539

A personal representative shall have no liability for continued distribution of real or personal property in accordance with a pattern of distribution that conformed to the law in effect when distribution began, notwithstanding any intervening change in law that would require a different pattern of distribution, unless he is actually aware, after the law is changed, of information relevant to the change in the rights of interested parties or otherwise fails to act reasonably in ascertaining such rights. Nothing in this section shall in any way affect any cause of action which the parties in interest may have among themselves.