I do too. Maybe that's a reason for my waiting so long to send them off? Subconsciously?
When Justin was in Uni, that's all I played until he graduated. Of course, I had to teleport his family in because I missed them.
Justin had his first born son, Joel, with him at college. I used Inge's apartment system and recreated the on campus apartment building I lived in in college, and had Joe stay there with him (didn't move him in, just made him selectable). It was nice, though, because Joe could take care of Joel while Justin studied. Josh's oldest son, Joshie Jr, lived next door to him, and Josh stayed there. The triplets were still kids, so they were teleported in for frequent visits, as well. And on the other side, Justin's cousin Gary Jr. (Joe's brother Gary's youngest child) lived, and Gary stayed there, as well. I can't just play one sim! I have to have many family members!