I personally don´t do the rule of staying in the lot. Why?
Doesn´t feel right to me. You would assume some sims might want to stay in the house, some other sims might rather another lifestyle like... ranch or.. country side or even city life. And I personally don´t ever choose a 64 by 64 lot when playing legacies. It is genuinely too much for a legacy.
I always find it weird but amusing when people have a horse in their legacies but they are in a 30x20 lot in the middle of coperdale.
As far as siblings I move them "out" of my sight. Meaning, lost in the outer world but nor really any specific lot or world.
