하안
Wu Jinhua also pointed out that in the late Han dynasty and the Three Kingdoms period, it was not uncommon to find married couples who shared the same family name. For example, one of Cao Cao's foster sons, He Yan, married Cao's daughter Princess Jinxiang (), who was possibly his half-sister (born to the same mother), even though the identity of the princess's mother is not confirmed. Wu Jinhua mentioned that a person will have no doubts that Cao Song was from the Xiahou clan as long as he/she understands that inter-clan marriages were not unusual in that era.