Joao:
Welcome! You will find all sorts of advice and support from all sorts of persons who are former JWs and persons who never were, but still participate in this community. We may seem dysfunctional from time to time, but all families are. We are family. We truly do love another in spite of differences.
My situation was the reverse of yours. I was a born in Witness who married a woman who became a JW in her late 20s. She was a Witness probably all of 7 years before she quit. Eventually I came around and saw the Watchtower for what it truly is.
My suggestion is to maintain your love and support of your wife and children. If they want to go to the meetings, don't just let them, help them. Do nothing to interfere in their practice of being a Witness. Do not talk about teachings or anything of a religious nature. Be happy.
The most powerful tool to prove whether a religion is true or not is the happiness test. Happiness is not to be confused with the joy of experiencing pleasure. It is being content and the absence of mental suffering (fear, regret, sorrow, resentment). Witnesses can never be happy. That is why the religion is proven false. Arguments about doctrine can go on forever. Happiness is now or never.