I feel sorry for the kids, if they don’t know now what is going on, sure as heck one day they will.
Yeah, at a fundamental level if he thinks it's OK and normal to use prostitutes then surely it's OK for his daughter(s) to be on the other side of that trade? If not, why not? Because I don't believe most people, even the ones trying to excuse it, really genuinely believe it's OK and normal, and what really drives that home is whether they would want their own daughter(s) doing it.
Maybe one of his patreons could ask him that question instead of simply enabling it with their donations.
If the kids don't find out what he did themselves, someone else will, and they will tell them.