law: 41. Declaration by infant, lunatic, etc.-
  (1) If any person , is by reason of infancy , lunacy or other disability, incapable of making any statement or doing anything required or permitted by or under this Act, the lawful guardian, committee or manager (if any) of the person subject to the disability, or , if there be none, any person appointed by any court possessing jurisdiction in respect of his property, may make such statement or a statement as nearly corresponding thereto as circumstances permit, and do such thing in the name and on behalf of the person subject to the disability.
  (2) An appointment may be made by the court for the purposes of this section upon the petition of any person acting on behalf of the person subject to the disability or of any other person interested in the making of the statement or the doing of the thing.