Have a dialogue. After seeing the nephew scold his grandmother, the child will feel more relaxed and talk to him. If the problem is not serious, we can solve it at that time. If it's a big problem, we can talk about it when we get home. Besides, we have an idea to pass on to our children. We can lose our temper, but we can't violate our principles, insult grandma and tell him that we need to respect the old and love the young.