Child's other mom is turning my kiddo anti-science and anti-vaccine. Help me fight the good fight!

My 11 year old spends 50% of his time with an anti-science and anti-vaccine family. Single parent me (in Ohio) doesn’t have a lot of support when I’ve tried to help fight some of those thoughts he’s been brainwashed with in the name of religion. I’m christian, but his other household is extremists. “You believe in...