@abc.abstractmethod<EOL><INDENT>def is_child_of_bank(self, id_, bank_id):<DEDENT>
return<EOL>
Tests if a bank is a direct child of another.

        :param id: an ``Id``
        :type id: ``osid.id.Id``
        :param bank_id: the ``Id`` of a bank
        :type bank_id: ``osid.id.Id``
        :return: ``true`` if the ``id`` is a child of ``bank_id,``  ``false`` otherwise
        :rtype: ``boolean``
        :raise: ``NotFound`` -- ``bank_id`` not found
        :raise: ``NullArgument`` -- ``bank_id`` or ``id`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

        *compliance: mandatory -- This method must be implemented.*
        *implementation notes*: If ``id`` not found return ``false``.