N.H. Rev. Stat. Ann. § 464-A:34

The guardian of the person and estate, or the person, or the estate, shall have the same rights that the ward would have, if legally competent, to waive the provisions of a will in favor of the ward, intended to be in lieu of distributive share, and shall likewise have the power to release said ward's homestead right, and take for said ward the same property and rights.