Boomer Dad thinks he can give away my house

Oh my father. He is actually generally pretty nice typically but he fell down this Trump antivax pit for years now. A few years back he found out that I got the covid vacinne. Not only did he ban me from his house for over a year because he felt like I was shedding vaccine, but the man called up my little sister and told her I was dying because I got the vaccine and that she could have my house when I died?!?
Two points here, my sister also got the vaccine. She was just smart enough to not tell Dad.
And the man really thought he could just choose what happens to my house if I died? I have kids and a spouse! It was wild!

Thanks Dad!

Edit: My Dad has no legal right to my house. He had nothing to do with the purchase. He is not on the deed. There is no real threat of him giving away my house. It was just so nuts that he thought he was entitled to make that kind of decision. It ended there because my sister is also use to my dads weird behavior the last few years.

I hear you all loud and clear. I am going to get on making a will asap.