75 Or “household.” The Greek work οἰκία (oikia) can denote the family as consisting of relatives by both descent and marriage, as well as slaves and servants, living in the same house (more the concept of an “extended family”).
76 Jesus’ point is that while a slave may be part of a family or household, the slave is not guaranteed a permanent place there, while a son, as a descendant or blood relative, will always be guaranteed a place in the family (remains forever).

In other versions

The slave does not remain in the house forever; the son remains forever.

Now a slave has no permanent place in the family, but a son belongs to it forever.

A slave does not remain in the household forever, but a son does remain forever.

A slave is not a permanent member of the family, but a son is part of the family forever.

And the slave does not remain in the household forever; the son remains forever.

And the servant abideth not in the house for ever: but the Son abideth ever.

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