According to the short vibrato video, I know I have a daughter-in-law. Don't bother me if you have nothing to do. It's an online buzzword, which means "I already have a girlfriend, so leave me alone". This sentence is usually used to respond to people or things that are irrelevant or don't want to pay attention to, expressing impatience or self-deprecating attitude. The source of this sentence is a Tik Tok user named "I have a daughter-in-law". He often said this sentence in videos, which was later imitated and spread by netizens and became a funny sentence.