What if I refuse to buy any of my family members christmas gifts?
Why would you not buy your family members a Christmas gift this year?
Because fuck them, they are seriously the most useless bunch of people on earth.
You are disgusted with your family members, that's clear, but have a heart. They love you just the same, and need you to show them you love them back. If they're listless and depressed, your behavior will only make the situation worse.
It's my right to respond how I wish, and fuck them if they are going to be depressed. They don't deserve Merry Christmas.
If they really are depressed, shutting your family out of your life will exacerbate their condition. If you don't want to buy gifts, why not consider giving them your time, maybe suggest they get into family therapy?