Breaking news from Sansu's interview. After thinking for a moment before writing the code, they realized that they couldn't relate these two fake father and son to Fu. For them, they were the only two people left in the Jie family (not counting Xie Ziyang being half a monster). This was a blood bond. No matter how much he deceived other people's eldest nephews and made his own nephew drink the northwest wind before the solution, they were all relatives whose blood was thicker than water.
Conception: