From a purely strategic standpoint the people like you in my family are seen as having chose the fascists over their queer family members, IJS. I don't know how "bad" your family is, but I cut off my dad after he told me "n words are taking all the welfare" and I don't talk to anyone who take his side on that issue. I've been called all manner of immature for that decision by people like you. But my dad is a racist chud, still is.

If they never face social consequences for being terrible people with terrible views they'll never change. You're helping to reinforce the idea that they're right in their beliefs, because they get no consequences for them. It is everyone's responsibility to hold our anti-social members accountable otherwise we end up with a hostile and anti-social society. Like we have. Because these people aren't being held accountable. So yes, to some degree it's absolutely your responsibility. But getting along is easier and doesn't require any difficulty or sacrifice on your part. MAGA is bad but so it's the quiet third that doesn't push back on MAGAts to keep the peace. Collaborators more or less. It's all the same to the people in MAGAs crosshairs.

I admire your passion

Thank you. I appreciate that we can have a conversation.

I disagree that it’s my responsibility to hold others accountable for their politics just because we’re related

Why wouldn't it be your responsibility? It's my responsibility, too, but as someone closer to them it seems you bear an even larger burden. It's part of being in a society.

I don’t think confronting someone over Thanksgiving dinner is going to win them

Not if that is the only time it ever happens. Even then, it is better than doing nothing and let them go merrily along making the lives of everyone around them a little bit worse.