As the (former) kid of a woman in your position, go with your gut. Which is protect that cub.
You have no idea how much your child will love, respect and adore you as they get older and realize you may have kept them from a very bad situation. Blessings to you, Anon. If you don't trust local authorities I'm truly at a loss. Doctor used to be a good answer….not so sure these days. (that goes for victims and those suspected of having been told/shown something I dunno). It's too hard to trust. Especially with your kids. Rough spot. I'll be thinking of you.