What does it mean to burn money for your ancestors?

This contains two levels of meaning:

The first level: "Burning money for your ancestors", which means to answer your question: He is burning paper (paper money represents the underworld) money, given to the dead). If you want to marry into his family, his ancestors are also your ancestors, so you say "I am burning money for your ancestors."

The second level: "I'm doing bad things while holding a girl in my arms." I'm just teasing you, so I "still smile evilly." I don’t understand the simple question you asked before, and I also know what girls are most worried about, so I deliberately made up unfounded things to tease you.

This also shows that your boyfriend is humorous and interesting, and that you have a good relationship. Bless you all.