He has an illegitimate son somewhere.

他在外边有个私生子。

Yet Phiatonslav's illegitimate son, bastard son Vladimir wound up with the throne.

然而斯维亚托斯拉夫的私生子——弗拉基米尔最后却夺取皇位。

Yiguan wants to acknowledge Dafeng, but Qiaqia advises him against doing so as Dafeng will not accept the fact that he is an illegitimate son.

一官要认回大风，但恰恰要一官为大风着想，因为大风一定不能接受自己是私生子的事实。