Not that easy... If they are underage, the first the DCF wants to do is remedy the situation unless there is strong proof that abuse is taking place.
Meanwhile, DCF comes to your home, the parents put on this great act, and is there when the kids are spoken to by the DCF people.
If kids take the initiative, there could be serious consequences by the parents after DCF comes out and they put on their dog and pony show...
In my opinion, there's a big difference if you are over the age of 18. Kids younger, unfortunately, don't have the same rights... :(
God, I hope I'm wrong. I wish for anything that I'm wrong. Please correct me if I am, so these kids can more easily speak out without severe consequences...