How do you split up the holidays?

My boyfriend and I have been together for 6 years. And I spent thanksgiving with him for the first time, this was a huge controversy between me and my sister because we always spend holidays at her house. Now the problem is that Christmas <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> my boyfriend has off and I would like to spend it with him and spend Christmas Day with my family. However I know this is going to be a fight again because i shouldn't be spending the holidays "in his side of the family" I'm 23 and people don't take me or my relationship serious in my family. Im literally contemplating to tell everyone that I'm volunteering all day (which I am in the afternoon) so I can spend the night time with my boyfriend and his family. 
P.S my sister is a princess and every holiday no matter what has to be celebrated at her house and I don't mind it either however, my brother in law is not a nice person and for he sake of my relationship I have never brought my boyfriend or brother in law around each other because my brother in law offends anyone without caring and my sister is in complete denial. My theory is we as a family can accept your husband because he's been around for a long time however, that doesn't mean that other people need to deal with it. Frankly my parents go to her house but if it wasn't for the live and respect I have for her and my nieces I wouldn't step foot in that house because wolf my brother in law.
All these years I've never spent a real holiday with my boyfriend and his family I just wanted this year to be about his family since he's always complaining about not being able to spend holidays with me because I'm always at my sisters. 
Am I wrong? 
How do you split the holidays ? 
Thanksgivings? Christmas <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a>? Christmas Day? New Year's <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a>? New Year's Day?