Hi Ze, this is a tough one. My husband and I struggled with this one too. We decided to give them age appropriate presentations about our condition. The reason we did that is that we didn't want them to hear it from anyone else. Presentation is everything and no one can present it better than us their parents. So every few years we revisited the subject. You know your child's understanding better than anyone evaluate when you believe he is ready. Take a deep breathe, our children surprised us with their understanding and their solid support to this day and they are all grown now.