A slave is not a permanent member of the family, but a son belongs to it forever.
Berean Standard Bible (BSB)
A bondservant doesn’t live in the house forever. A son remains forever.
World English Bible (WEB)
And{G1161} the servant{G1401} abideth{G3306}{(G5719)} not{G3756} in{G1722} the house{G3614} for{G1519} ever{G165}: but the Son{G5207} abideth{G3306}{(G5719)}{G1519} ever{G165}.
Strong's King James
(35) But the slave doesn't remain in the house into the age, the son remains into the age.
The F.O.G
The F.O.G Message
and the servant doth not remain in the house—to the age, the son doth remain—to the age;
Young's Literal Translation