They've started already. The ruddy Christmas threads. People wanting to spend Christmas with "our own little family" and sod the parents and ILs
Personally, I'd be devastated if DD didn't consider me part of her immediate family just because she'd married and had DC.
And those of you who only think of your DH/DP and your children as your "own little family" - do you think you'll be so blase about it when they've grown up and moved out of your home?
Come on now, be honest.