It's my understanding that this wouldn't happen.
If there was a situation that meant it was too dangerous to tell the parents, they would still tell them, only now social services would have to be involved.
Teachers cannot just remove parental responsibility!
If they believe there's a danger from the parents to the children, it has to be addressed, and it still has to involve the parents until the courts decide otherwise.
Adult TRAs love to pretend that this must all be secret, because children are getting abused by their parents by 'coming out'.
They're splashed across social media positively encouraging division between children and their parents.
(i'm not suggesting you're doing that Adam).