What is the ruling on a father expelling his disobedient son who insults him and divorces his mother, given the presence of another son who steals money?

Divorce is inherently reprehensible unless there is a need for it. It may be permissible when there is a need for it, such as due to the wife's bad character or her failure to fulfill her purpose. As for expelling children from the home, it should not be done unless the harm of their remaining becomes great. The questioner is advised to keep his wife and strive to reform his children by counseling them, encouraging them to associate with righteous people, and persistently praying for their guidance.