You have posted this generic answer several times. Ok. Maybe he's "unwell". My point though is that there is very little difference between believing that your children are child actors and believing that politicians eat fetuses in a pizzeria on a regular basis. Both things are completely out there and rely on zero evidence.
Also, believing members of your family are impersonators or aliens is something young siblings try to persuade one another all the time. It's not unheard of.
Anyway, my larger point is that we should not tolerate antisemitism because of "crazy". Just because one adds outrageous beliefs on top of hate doesn't excuse the hate.
This is what happens in these discussions: people take the genuinely batshit things he's saying and then generalize them to a point where they're merely stupid, and not batshit. Then they say "well, that might be wrong, but it's not crazy!". Well, you're right: it's not crazy. It's also not what he said.