Rashi on Leviticus 25:54/רש"י על ויקרא כ״ה:נ״ד

1ואם לא יגאל באלה AND IF HE BE NOT REDEEMED BY THESE — by these (his relatives) he may be redeemed, but he cannot be redeemed through the termination of the six-years-period of servitude as in the case of a Hebrew servant of a Hebrew master (Kiddushin 15b).

2הוא ובניו עמו [HE SHALL GO OUT…] BOTH HE, AND HIS CHILDREN WITH HIM — the hèathen who acquires a Hebrew servant is bound to provide his children also with food just as is the Israelite master (cf. Rashi v. 41).