def get_relationship_smart_family_session(self, family_id=None):
if family_id is None:<EOL><INDENT>raise NullArgument<EOL><DEDENT>raise Unimplemented()<EOL>
Gets the ``OsidSession`` to manage dynamic families of retlationships.

        arg:    family_id (osid.id.Id): the ``Id`` of the ``Family``
        return: (osid.relationship.RelationshipSmartFamilySession) - a
                ``RelationshipSmartFamilySession``
        raise:  NotFound - no family found by the given ``Id``
        raise:  NullArgument - ``family_id`` is ``null``
        raise:  OperationFailed - unable to complete request
        raise:  Unimplemented - ``supports_relationship_smart_family()``
                is ``false``
        *compliance: optional -- This method must be implemented if
        ``supports_relationship_smart_family()`` is ``true``.*