I hope there are no problems for you with your family. I've never been in your situation myself but I've read and heard the stories of many many people who have. The two main pieces of advice they all give is to not be too dogmatic about things and to pose everything as a question, rather than a statement of fact. Known as 'socratic questioning' it encourages their own critical thinking skills to kick in and helps to stop them doubling down on their beliefs (which, by the way, you might find they do as a reflex bourne of conditioning).
The other thing they advise is to be the best husband and father you can, even if you're struggling. This might be especially true in your daughters case but what they mean by that is to try to do things with them away from the cult. So fun family bonding stuff....anything to allow them to see that you haven't changed as a person and that life away from watchtower can be satisfying, fun & safe etc. It also gives them breathing space to start to think for themselves. Many people have said that physical time & space away from constant reinforcement of watchtower beliefs allowed them to really think properly (it's also why cults insist so strongly on meetings).
I wish you all the best my friend and I'm happy another person will not be waisting their life in servitude to watchtower!
