The spirit who is a slave, not a son, and yet remains faithful to his master. A slave of course does not remain in the house forever i.e. within us, our 'temple', a spirit of slavery does not endure eternally in the house (the Lord spoke of perservering).
On returning He and His Father make Their home with this person - their spirits are renewed - they are adopted sons and they know in their renewed spirit that they will never leave His house.
They did not know this of the spirit they had before in that same way - they were a slave, perservering.
No matter how faithful the slave, the privelige of sonship is not earnt by a slave - the work of a slave does not exact debt - only by a gift do they become a son.
Those who are not doing as He has instructed (love) are removed from the source of light and placed in the dark like the hypocrits, a place (condition) where people are known to gnash their teeth (in envy). You would notice how some hate good things happening to others.
The jovies will tell you how "a slave doesn't remain" means other bad people who are evil and left (escaped from) us.
It's a teaching story, not an historical who's who.
Well, that's one way of finding life in it - show your dad that.
Bang