This is a fictional setting, and the story is about everyday household matters. There shouldn't be too many awful relatives. Reading about the worst kinds of scumbags is already irritating enough, let alone writing them myself...
As for forms of address, servants can refer to themselves as "I," but they can't call their masters "you." So you won't see them calling themselves "your servant," "this maid," or "this old servant."
Boys and girls in the family have separate rankings by birth order.
Each young lady has her own good points and shortcomings. Some are close, others less so, and they may get jealous or compete for attention, but there won't be any poisoning or anything like that...
If they happen to fall for the same handsome young man, they'll work together to pursue him. Whoever wins, the family benefits, so there's no reason to let an outsider have him!
Ordinary families don't have officials among them, so there won't be any complicated rules for the inner household.
Some dialect may appear, such as "ba," which means "give": "Give me a hundred yuan~"
"Zijia": oneself
I read it from the Tang Dynasty. It is very well written. Unfortunately, the author must have stopped filling in the holes. The content of this book has become like a petty official. I like it very much!!!