I grew up in a JW family. My parents became less active and were struggling with their beliefs for about 4 years before I refused to go to meetings anymore.
Be as honest as you possibly can with your wife AND your children!!!!!!!!!!!!! I understand you may want to take it somewhat slowly.
Do NOT FORGET YOUR KIDS!!!!!!! Do you want them to be raised in this cult? Your son is getting ready to start kindergarten. HE IS ALREADY TAKING IN THE KOOL-AID MUCH MORE THAN YOU'D LIKE TO THINK!!!!!!!! I KNOW.
This cult will destroy your family. It destroyed mine because my parents were not honest with me and my sister or with my mother's family.
Raise your children in a healthy, positive environment. That would mean away from anything JW.