Oh ok, now I get it, the scum father and the Prince of Yun are bros, the princess' mom is a princess and an aunt because she's married to the scum prince. I thought she was born as a royal, but now I understand why the servants were rude of her. But what's her real background that they called the babe of lowly upbringing? By the way her mom it's obviously smart and educated, people with no upbringing at that time wouldn't be like that. Anyway, this means that these two are uncles (our MC and the 2nd son of Prince Yun).
Better this concubine b1tch won't lie a finger on the little girl or I'm gonna choke >:c