code: protected function scheduleParentChangeEvents(CustomerInterface $customer)
      {
          if (!$customer->hasChildren()) {
              return;
          }
  
          foreach ($customer->getChildren() as $child) {
              $this->persistenceHelper->scheduleEvent(CustomerEvents::PARENT_CHANGE, $child);
          }
      }
docs: Schedules the parent change events.
  
  @param CustomerInterface $customer