I'm glad you are breaking free for a long while. You are not overreacting to your family's sickness and the pretense of warm connection which is demanded by the holiday.
When we betray ourselves, it depresses us profoundly, if we have any integrity at all.
Your mother and your two sisters have no integrity due to their distorted brains. They live every moment of life in pretense and dishonesty.
But you are yearning to walk a path of integrity and authenticity. So I hope the breaking free will allow you to actually, truly, break free.