I don't know what brought it to mind, but I got to thinking about Han's hilarious expression when Leia tells him that she loves Luke because he's her brother, and we all know exactly why he's so "lol what" until he decides to roll with it.

I do really enjoy that he's allowed to have this response that doesn't minimize how absolutely batshit this reveal would be for anyone actually involved in the situation, despite it working conveniently to wrap things up in the narrative.

I also enjoy that after he processes the shock of Luke and Leia being siblings and Leia knowing about this (with zero explanation of how long she's known about it at that point), he's like ... eh, whatever, this is awesome actually.