I'm not going to invite any 45 supporting member of my family to the thanksgiving get together as I don't consider them part of my family or even American any more.
What do you mean by a "45 supporting" person?
Trump was the 45th president of the US, so a 45 supporter is anyone who voted for or likes him.
Have you spoken to these family members about their beliefs? It can be nice to be around family during the holidays, and judging your family without hearing their reasoning for their beliefs is unfair.
I don't want to hear their beliefs.
I'm not saying you have to agree with them, but you should at least try to hear them out so you can understand where they're coming from. It's not right to judge someone, especially family, without knowing how they feel. I think you should still invite them, and try to be civil toward one another.