I'm not going to let my wife's cousin see my future child because they are not vaccinated
Why do you feel justified in doing so?
I have the right to decide who would be introduced to my baby.
That's perfectly understandable. You want to protect your children, and keeping unvax'd people away from them is a good way to do so.
Sure, I'm smart and the best parent anyone could ask for.
I am so thankful you care about your kids. There are a lot of people who could care less about something so serious.