I made it clear that they would be downstairs with us, and not isolating themselves as usual.
Dd1 has, but Dd2 hasn't really. I decided I wouldn't be harsh about it, with it being the season of goodwill and all, but asked nicely that she join in the family games, watch TV etc. She brought her phone and charger down, was on it in between every go while playing games, and on it all the way through the film, just looking up occasionally to appease me. She also disappeared upstairs at every opportunity, avec phone, to go to the loo, to make a call, etc. Every time she had to be called back down when I realised she'd been gone for up to half an hour.
I haven't bothered today, and haven't seen her except at lunch and tea time.
Please tell me this isnt just happening in my house!