Daughter and son-in-law are angry. How does mom convince them?

Speak well of your son-in-law to your daughter, and express yourself as your own son to your son-in-law

In front of the daughter, we should say more good things about the son-in-law, say more about the advantages and benefits of the son-in-law, let the daughter calmly see the advantages of the son-in-law, and also find out the main aspects of the contradiction with her daughter, so that the daughter can see that she is also responsible. On the contrary, be sincere and reasonable in front of the son-in-law, first show that the son-in-law is his half son, or even his son, and let the son-in-law put down his guard. Slowly help the son-in-law see the advantages of his daughter. In short, it is necessary for both sides to make peace.

When the anger of both sides has subsided, let both sides think from each other's standpoint and let both sides realize their mistakes, so that the contradiction will be eliminated.