Thanks for the chapter!
Is little sister's boyfriend from the same Xiao family as the head of the auction house? Ugh.
I'm terrible keeping track of Chinese names and families. In any case, Tang family head probably interested in MC for several reasons both good and bad. Like knowing recipes that obviously weren't just slapped together even if have bad reactions, Miss Tang's feelings for him despite him only agreeing to a marriage into his family not him into hers, standing up to and beating Nanny (who seems to be holding a grudge,) and likely wanting him to work exclusively for the Tang family while breaking up his connections with the Ye family.