I heard the theory that she took the kids so they wouldn’t accidentally blab that their dad was acting funny or was brain dead.
She’s a Demoncrat, so it’s possibly true.
I don’t think he’s brain dead. I think that’s fake news. However, I wouldn’t be surprised if she removed the kids for the reason you state, that the kids might divulge something about their dad’s true condition, and what daily life is like for them. One day, those kids will grow up, and will probably spill the beans, but it won’t matter by then.