Yuan Shao
Yuan Shao's mother was originally a servant of Yuan Feng. Since Yuan Feng lacked male heirs, the birth of Yuan Shao elevated his mother to the status of a concubine. The "Records of the Three Kingdoms" contend that Yuan Shao was in fact an older cousin of Yuan Shu, and was adopted by the elder brother of Yuan Feng, Yuan Cheng, who also lacked male heirs. The act of adopting Yuan Shao would have infuriated Yuan Shu, because his own mother, a concubine of Yuan Feng, held a higher status than that of Yuan Shao's mother; however, by Yuan Cheng's adoption of Yuan Shao, Yuan Shu was no longer the eldest son of the Yuan family. Yuan Shao enjoyed more privileges than Yuan Shu, despite the latter being a blood-related member of the clan.