How to deal with MAGA cult family

I(white 34 M) don’t know how to deal with my conservative family members. I don’t even recognize my parents anymore. They’ve always leaned conservative but were usually fairly chill. Over my 20’s they slowly became more radicalized by Fox News, especially when Obama was president. When Trump came along they were primed to be willfully manipulated by whatever that man says. Flash forward to today, they’ve gone full Christofascist Bible thumping pro-Russia MAGA drones and they’re the most scared and hateful people I know. They’ve wrapped their entire personality around supporting whatever Trump says or does and they’re fully ready to bend to the will of any right-wing billionaire at the drop of a hat. Suddenly they hate Canada, Greenland and are so excited for Trump to invade/destabilize these places for their resources. It’s gotten so extreme that both my dad and mom have told me that genocide is a good thing - “we gotta pull the weeds from the garden so the better plants can flourish and not have their land and resources stolen”….

I am married to the most amazing wonderful woman in the world who happens to be black. We recently had some kids together and my parents are like glitching out about it. They’ve always wanted to be grandparents and they say they love their grandkids but in the next breath they say something blatantly racist. They openly support politicians who are against interracial relationships and post about how the white race is under attack and diversity is a cancer to society on Facebook. My mom even got into the QAnon crap for awhile and she dove so far into psychotic conspiracy theories that it seems like she doesn’t even live in the same planet as us anymore.

This is who they are now and idk what to do. We’re already close to no contact. My kids ask where their grandma and grandpa are and I don’t know what to tell them anymore. My parents don’t seem interested in coming to visit. One day my mom will call me sobbing about how she misses her grandkids but then when I invite her to come visit she calls me a “globalist” and tells me she won’t be visiting because I work with people in other countries for my tech job.

This is just my parents. I’m not even mentioning my uncles, sister and others. I just don’t know these people anymore. How do I tell my kids that they won’t be seeing their grandparents much, or ever again anymore? My kids and wife come first and I’m not going to let them grow up around this nonsense. I feel like I’m mourning people who are still alive and it’s making me feel so depressed. How do I get through this?