My sister-in-law, and my niece, are rabid MAGA conservatives who home school their kids. They have been involved with RFK fighting mandatory vaccines for babies and children for probably about 10-15 years.
It’s weird that they cling to him since there are actual conservatives, politicians and otherwise who are anti-vax. Personally, I’d pass him by despite his stance on vaccines, since he’s left-wing on other issues.