No will shall be effectual to pass either real or personal estate unless duly proved and allowed in the court of probate; and the probate of a will devising real estate shall be conclusive as to its due execution, as in case of a will of personal estate.
RSA 552:1
RS 157:1. CS 166:1. GS 175:1. GL 194:1. PS 187:1. PL 298 :1. RL 351:1.