Daaaammmmmnnnn That's a lot like what it's like when I'm back home.

You'll have internet access at least? If it's for Christmas, can you like... set up days/times to have Christmas movie/cartoon marathons conveniently timed for when everyone else is awake and at home? Do your parents have to work for a good chunk of the three weeks?

Can you plan out having like... an hour long walk each evening when everyone's home? It would be good for an escape and also sorta like a moving meditation. (Not possible where I live! It gets to -40C!). You could have your T back you up on that plan if your mom gets on your case about it... just be like "you can call my T mom. It's part of my treatment plan. These walks are something I have committed to doing".