I think when you are born into a happy JW family you can't even consider that these things happen in families in the truth.
Fact is that these sorts of things do happen in families from all religions and backgrounds. It's the mindset that you must not bring reproach on Jehovah's name by making it known or by getting out that compounds the problem.
BUT a person who treats the ones they love so badly surely cannot really believe in God and that he sees all and will judge you accordingly.