def update_family(self, family_form=None):
pass<EOL>
Updates an existing family.

        arg:    family_form (osid.relationship.FamilyForm): the form
                containing the elements to be updated
        raise:  IllegalState - ``family_form`` already used in an update
                transaction
        raise:  InvalidArgument - the form contains an invalid value
        raise:  NullArgument - ``family_id`` or ``family_form`` is
                ``null``
        raise:  OperationFailed - unable to complete request
        raise:  PermissionDenied - authorization failure
        raise:  Unsupported - ``family_form`` did not originate from
                ``get_family_form_for_update()``
        *compliance: mandatory -- This method must be implemented.*