Rule 2.1. Construction of rules.

 The rules adopted by the Supreme Court regulating the practice and procedure of the Orphans’ Courts of this Commonwealth, and the rules adopted by such courts, shall be liberally construed to secure the just, speedy and inexpensive determination of every action or proceeding to which they are applicable. The court at every stage of any action or proceeding may disregard any error or defect of procedure which does not affect the substantial rights of the parties in interest.