Splitting the family wasn't based on the number of heads, but equally split.
The family business was divided into six parts, one for each of the four branches, and one for His Highness and his Princess.
The Wang Fu's courtyard that they were living in now was naturally given to the second branch who inherited the title. The capital's Donglin Prince's Mansion was also the second branch's, and the rest were equally divided.
Wangfei said that although Wangye had passed away, Wangye treated his only daughter bai bao Zhu like a Pearl. He often said that he would give all the good things to bai bao Zhu in the future. So, Wangye's share was naturally given to bai bao Zhu.