we can throw it to last fall, that'd be fine. he's been around for 4 years, and has a kid. if they stayed friends/friendly, then she'd probably know about him too. jay doesn't let most people meet Sebastian for the obvious reasons, but if they did end up friends, then she would have met him at some point.
and if you meet the right one, lol, you meet the right one. that's when things change ha.