If his master have given him a wife, and she have born him sons or daughters; the wife and her children shall be her master's, and he shall go out by himself. The wife and her children shall be her master's - It was a law among the Hebrews, that if a Hebrew had children by a Canannitish woman, those children must be considered as Canaanitish only, and might be sold and bought, and serve for ever. The law here refers to such a case only.
Related Commentaries of Exodus 21:4
Exodus 21:4
4 If his master have given him a wife, and she have born him sons or daughters; the wife and her children shall be her master's, and he shall go out by himself.