@abc.abstractmethod<EOL><INDENT>def get_relationships_by_family(self, family_id):<DEDENT>
return<EOL>
Gets the list of ``Relationships`` associated with a ``Family``.

        :param family_id: ``Id`` of the ``Family``
        :type family_id: ``osid.id.Id``
        :return: list of related relationships
        :rtype: ``osid.relationship.RelationshipList``
        :raise: ``NotFound`` -- ``family_id`` is not found
        :raise: ``NullArgument`` -- ``family_id`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

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