Any Person shown to have an interest may become a Party to any proceeding on Motion briefly setting forth that Person's relation to the Cause; or upon Motion of any Party, such Person may be made a Party by order of Court notifying that Person to appear therein. If the Person so notified shall neglect to appear and respond, the Petition shall be taken pro confesso as against that Person. No such decree pro confesso shall be set aside, except by agreement, or by order of the Court upon such terms as justice may require.
N.H. R. Cir. Ct. Prob. Div. 139