RSA 463:26 Investments.

Every guardian of the estate shall invest, in the name of the minor, or in the guardian's own name as guardian of the minor, the money and the proceeds of all real and personal property of the minor not required for the minor's support in the following described classes of property only, unless authorized or directed by the court:
I. In notes secured by mortgage of real estate at least double in value of the notes, or in notes or bonds secured by mortgage insured by the United States Secretary of Housing and Urban Development and guaranteed by the United States of America.
II. By deposit in some incorporated savings bank in this state or in the savings department of a national bank or trust company located in this state, or in shares of any building and loan association