A deed following the form entitled “Administrator’s Deed”, when duly executed, has the force and effect of conveying to the grantee the fee simple title which a deceased person had at the time of his death, or which such administrator has with covenants that (1) the administrator is duly qualified to act as administrator, (2) the administrator has full power and authority under and by virtue of an order of the Court of Probate to bargain and sell the described premises, and (3) the administrator and his successors shall warrant and defend the granted premises to the grantee against all claims and demands of any person or persons claiming under the administrator.