Cao Chong (196-208), whose real name was born to Mrs. Huan, was the son of Cao Cao.

Cao Chong is clever, kind and different, and is deeply loved by Cao Cao. Cao Cao boasted to the minister several times that he meant to let him inherit. However, Cao Chong died before he was a teenager, at the age of thirteen.

Therefore, Sancao is only Cao Cao, Xelloss and Cao Zhi, not including Cao Chong.

I hope to adopt my answer.