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Cao Ren was a younger second cousin of Cao Cao. His grandfather Cao Bao (曹襃) and father Cao Chi (曹熾) served in the government of the Eastern Han dynasty. He had a younger full brother, Cao Chun. As their father died when they were still young, Cao Ren and Cao Chun lived with another family. They inherited their family fortune when they became older. They were known for being wealthy and having hundreds of servants and retainers.