@abc.abstractmethod<EOL><INDENT>def reassign_relationship_to_family(self, relationship_id, from_family_id, to_family_id):<DEDENT>
pass<EOL>
Moves a ``Relationship`` from one ``Family`` to another.

        Mappings to other ``Families`` are unaffected.

        :param relationship_id: the ``Id`` of the ``Relationship``
        :type relationship_id: ``osid.id.Id``
        :param from_family_id: the ``Id`` of the current ``Family``
        :type from_family_id: ``osid.id.Id``
        :param to_family_id: the ``Id`` of the destination ``Family``
        :type to_family_id: ``osid.id.Id``
        :raise: ``NotFound`` -- ``relationship_id, from_family_id,`` or ``to_family_id`` not found or ``relationship_id`` not mapped to ``from_family_id``
        :raise: ``NullArgument`` -- ``relationship_id, from_family_id,`` or ``to_family_id`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

        *compliance: mandatory -- This method must be implemented.*