Jaina and Jacen
Jacen had most definitely noticed. Their shared twin bond was not as strong as it had once been and that was altogether his fault, but he could sense his sisters happiness and it was the pilot from the other timeline of their world that had made her feel this. He was happy for her.
That said...
"So I'll need to talk to him" he said, moving to stand next to his sister. He didn't know how much she knew, or remembered. But he had done the big brother speech to every one of her boyfriends and this was no different. But ultimately he was making Jaina happy, so he might leave out the 'can literally melt your brain' threat for this guy.