def get_family_notification_session(self, family_receiver=None):
pass<EOL>
Gets the ``OsidSession`` associated with the family notification service.

        arg:    family_receiver (osid.relationship.FamilyReceiver): the
                receiver
        return: (osid.relationship.FamilyNotificationSession) - a
                ``FamilyNotificationSession``
        raise:  NullArgument - ``family_receiver`` is ``null``
        raise:  OperationFailed - unable to complete request
        raise:  Unimplemented - ``supports_family_notification()`` is
                ``false``
        *compliance: optional -- This method must be implemented if ``supports_family_notification()``
            is ``true``.*