Well, you shouldn't worry about it that much.

[ then he will do just that! he'll start to climb up to get onto a slightly higher branch than hers. it'd probably be easier for him, with his longer limbs and all, so make way, big bro is coming up. ]

You know who you are, right? Who cares who you remember or what your other life was about. Your current life is all that matters. It's the current one that you're living, anyway. And will die in!