One can easily find S/D/W/H/o written on government or official forms (e.g. banking forms) along with an empty space. In the provided empty space you need to write the name of one of your relatives from the given list i.e. Son, Daughter, Wife, or Husband. Make sure you place a tick mark over the correct character (in S/D/W/H/o) so that the relationship can be identified.