As has been said by many, it is a tough time for many of us and we just cope in the best way we know how. My suggestion is to be kind to yourself and make sure that DD has a wonderful day as it really is all about her. Spend some quality time with yourself. If you do end up going to see the 'family' then don't be where everyone is, go outside, go for a walk, but most of all focus on you.
take care and I hope you and everyone else gets through this tough time of year.