Jason was your twin, but ended up kind of leaving you behind after becoming Robin, so that definitely put a strain on your relationship. Then he died, you turned to a life of crime, he got revived, you met again and now your relationship's pretty good. And, every now and again, you'll come by the Manor and just kinda chill.

"And this is the Batcave." Jason gestured grandly to said Batcave. You'd been down here multiple times before, but he still decided to do the whole spiel.