Why do you need to be polite?
Are you white? Did your family vote for Joe?
Okay. Well, first of all, YOUR healthcare is not their business, so the most polite way is to say nothing at all.
If you white, know that your family members who went all in for Joe, voted for and support those who believe YOU are a racist, a white supremacist, a deplorable, morally bankrupt, a kkk member, a white nationalist and worst of all, believe everything you have accomplished in your life is nothing more than an extension of your white privilege. Of course, they'll tell you "they" don't believe that, but that's what they voted for. So again, why do you feel the need to be polite about your healthcare decisions?