If my parents-in-law die, I still have a brother-in-law who is only a teenager. What should I do?

You are morally obligated to support your brother-in-law.

Obligations are divided into moral obligations and legal obligations. If you don't support your underage brother-in-law, no one will sue you for abandonment, but you will be morally condemned. If your wife has divorced you, he is not your brother-in-law, and it is understandable that you ignore him. Instead, you should ask him about his life and study.

From a legal point of view, your wife has the obligation to support her underage brother. (Basis: Article 29 of the Marriage Law of the People's Republic of China. Brothers and sisters who are financially capable have the obligation to support minor brothers and sisters whose parents are dead or whose parents are unable to support them. Brothers and sisters who have the ability to be raised by brothers and sisters have the obligation to raise brothers and sisters who lack the ability to work and the source of life. )

Because you and your wife live in the same family, you must have a common moral obligation.