The father asked his son: "What do you want?" The son replied: "What I want is not material.

First of all, I don’t think this is a joke. I think it is a philosophical question. Dad asked his son what do you want? This definitely means that he wants to ask his son what he wants in his heart. His son replied that what he wants is not material things, which shows that he thinks family love is more important than material things. If everyone gives a little love, the world will become a beautiful world. Family affection cannot be measured by money, and the same is true for love. It is a great expression.