Anti-vax in-laws... advice?

Mo

FIRST IM NOT HERE TO DEBATE. My husbands brother and his wife don’t believe in vaccinations. My husband and I have very different political views than his brother and his wife. We don’t mind their political views and are open minded to the fact every one thinks different. However, they seem to be less accepting of our views and for that they rarely want to hang out or visit us. Though they live less than a mile away. This type of relationship is how it’s been before I have ever met my husband, they don’t like him because of his views(so it seems) and talk to him like he is uneducated. I have tried to maintain a good relationship with my sis in-law and try to be very respectful to her views when we text or do visit them(she always tries to explain her views to me without me prompting her).

Well I am a big supporter of vaccinations and recently posted on FB to everyone that if you are sick, or don’t believe in vaccinations for yourself or your children, then I don’t want you around my baby twins when they are born. Period.

I stand firm to my beliefs and doing what I believe is right. My husband informed me tonight that his brother and his wife don’t vaccinate. I had no idea. My sis in-law also tagged me in some post about why vaccines are unsafe for kids. How would you approach this situation without upsetting someone while still standing up for what you believe in? Is it possible?

EDIT: Thank you everyone for the responses!! As much as I hate to ban someone from seeing the new babies, I have to stand my ground in what I believe is best for them. It what it is, and I will be nice, but firm. I’m sooo glad my husband and I have the same views and he is supportive.