Ok, cool, so it's not totally out of nowhere that Rachel could call Jean 'mom.' I haven't read every appearance, obviously, but I wasn't sure if the two had actually ever spoken, or if Jean still felt a little weird about the idea of an AU 'daughter' of hers banging about (as I recall, she did, quite a long time ago, back in between her first resurrection and second death, IIRC).
Thanks for the heads up! In that case, it's kind of cute, Cable and Rachel not only acting like siblings, but like Scott and Jean are their parents.