He Yan
When He Yan was about six, his mother was taken as a concubine by the warlord Cao Cao, after which she became known as "Lady Yin". After being adopted by Cao Cao, He was raised with the other princes of Wei, including Cao Cao's eventual successor, Cao Pi ( 220-226). Cao Pi resented He for acting as if he were a crown prince, and referred to him by the name "false son" rather than his real name. He later married one of Cao Cao's daughters, Princess Jinxiang, who may have been one of He's half-sisters. As a result of his adoption, He Yan spent a considerable amount of time with Cao Cao during his childhood.