N.H. Rev. Stat. Ann. § 547-B:5

At the request of a relative, friend, or other interested party, the public guardianship and protection program may, in the discretion of the probate court, be appointed co-guardian. Both co-guardians shall make themselves readily available to each other to consult with each other, to gather and share all relevant information, and to plan and decide procedures which execute the powers and duties assigned by the appointing court. Disagreements shall be resolved upon petition by decision of the court, prior to which emergency decisions by the public guardianship and protection program shall prevail. Absence or unavailability of either co-guardian empowers the other to act in the capacity of guardian.