According to Netease News, Cao's son has a wife, and his daughter-in-law is Ye Ping, the daughter of Ye Anping.

Ye Anping used to be Cao's business partner in Thailand, and later Ye Anping returned to China with Cao. Because of the good teacher-student relationship, Ye Anping married her daughter Ye Ping to Cao's son and became Ye's wife.