@abc.abstractmethod<EOL><INDENT>def get_families_by_search(self, family_query, family_search):<DEDENT>
return<EOL>
Gets the search results matching the given search.

        :param family_query: the family query
        :type family_query: ``osid.relationship.FamilyQuery``
        :param family_search: the family search
        :type family_search: ``osid.relationship.FamilySearch``
        :return: the search results
        :rtype: ``osid.relationship.FamilySearchResults``
        :raise: ``NullArgument`` -- ``family_query`` or ``family_search`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure
        :raise: ``Unsupported`` -- ``family_query`` or ``family_search`` is not of this service

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