code: def children(self, pid_actor):
      ray.get(pid_actor.report_pid.remote("children", os.getpid()))
      ray.get(
          task_finish_child.options(name="task_finish_child").remote(
              pid_actor
          )
      )
      ray.get(
          task_sleep_child.options(name="task_sleep_child").remote(
              pid_actor
          )
      )
  
imports: import asyncio
  from collections import defaultdict
  import os
  from typing import Dict
  import pytest
  import sys
  import time
  from ray._private import ray_constants
  from functools import reduce
  import ray
  from ray._private.state_api_test_utils import PidActor, get_state_api_manager, verify_tasks_running_or_terminated, verify_failed_task
  from ray.util.state.common import ListApiOptions, StateResource
  from ray._private.test_utils import async_wait_for_condition_async_predicate, run_string_as_driver, run_string_as_driver_nonblocking, wait_for_condition
  from ray.util.state import StateApiClient, list_actors, list_jobs, list_tasks
label_desc: Use image node_id 1 for calling the ChildActor obj's underlying member method code with example usage: obj.children(pid_actor) without return types