♀? Selective neglect
You can ignore him selectively. Parents can ignore him first, and don't communicate with their children in eyes, expressions and body language, which will make them feel that you have him all the time and the situation will not be alleviated.
Let the children know that crying is useless.
We should let him know that crying like this won't solve the problem, even if your request is reasonable, I won't agree.
Correct educational methods
When we ignore him, he will gradually stabilize his mood and stop trying to show it. At this time, we will educate him.