code: def disconnect_child(self, sprite, *handlers):
          
          handlers = handlers or self._child_handlers.get(sprite, [])
          for handler in list(handlers):
              if sprite.handler_is_connected(handler):
                  sprite.disconnect(handler)
              if handler in self._child_handlers.get(sprite, []):
                  self._child_handlers[sprite].remove(handler)
  
          if not self._child_handlers[sprite]:
              del self._child_handlers[sprite]
docs: disconnects from child event. if handler is not specified, will
          disconnect from all the child sprite events