I'm sorry that you're dealing with this. If you've done any reading here, you'll see that those opinions are not received well and in general, it's been my experience they're not the consensus nor received well anywhere (with the exception of like minded individuals). Sadly though, at least here in the US, 1 in 4 conservatives believe this. Heck, more than 50% still believe the election was stolen!
But I hear you.. Facts, science, logic and common sense goes out the window. There is one thing you can counter the vaccine chip nonsense with. Ask him if he uses a smart phone
You can be pinpointed on a map just by making a call and many of the apps track your every move and preferences. Also ask him if he uses a computer. Just by visiting a website, adverts will pop up and populate other sites you visit, acquire your email and fill your inbox with junk. So if he's worried about an actual microscopic chip that's too small to see suspended in a liquid that can pass through the opening of a hypodermic needle, he should be more concerned about the devices he's using that know all about him.
I wish I had a solution for you but those that subscribe to this type of feelings and beliefs aren't going have their minds changed easily if at all.
Positive thoughts, facts, science and reality....