The sound insulation effect of the building is not very good. If friends upstairs are running around the house, the residents downstairs may be affected. It is suggested that friends upstairs do some small activities at home, so that everyone can better enjoy our living space.
Face-to-face communication
If the private message reminder is not ideal, you can try to go upstairs directly and communicate face to face with your children and parents. Tell them it's late, and hope they can pay attention to their children's behavior. At the same time, we should also affirm the children's previous progress and encourage them to do better. I believe that this kind of communication will not only arouse their antipathy, but will make parents pay more attention to it, thus strengthening their control over their children.
Speak with facts
If none of the above methods work, you can only speak with facts. When children are running and playing, they might as well record those sounds and play them to their children and parents. Let them hear for themselves what trouble their behavior has caused downstairs. I believe that parents will pay more attention to this problem when they hear the noise made by their children, and then strengthen their education and restraint.