This is clearly a case of lying through one's teeth, anyone could see that Qin Zhiyou wouldn't slip up to this extent, he did it on purpose.
If it were a usual day, it might not matter but now Bai Changyou and Cai's mother believe they already have kinship with the third house. Cai Yiren's marriage to Qin Zhizha has already been arranged, and moreover, the two families are discussing cooperation. Qin Zhiyou still dared to do this, it's like he's trying to show them who's boss!
Moreover, he is, after all, Lu Weixi's biological father, and this son is her half-brother from the same father. Qin Zhiyou also counts as Bai Weiyi's brother-in-law. Blood is thicker than water, they refuse to acknowledge him, but so what? Bai Weiyi is only five years old, what's wrong with being a little naughty?
Bai Changyou was the first to speak up. He put on the facade of an elder, his face stern as he bellowed, "Qin Zhiyou, you've gone too far!"