It's still rude, did he ask? Did he find out if he was an orphan? Clearly he is an inner disciple of Lan, he can't just leave that and join another through marriage.

[Funny how he cares about propriety and proper things when it's not personally him.]

And of course, we are close, he is mine.

[My child.]

And Lan Zhan raised him to the age he is now.