Truthfulness with adult children about ADD

My DH has ADD along with Bipolar and possibly OCD. He is not medicated. I have one adult son diagnosed OCD and ADD. Another son diagnosed ADD. Non of this is ever talked about. My adult children watch the interactions between my husband and I and see it as fighting. Only my daughter know my husbands diagnosis. My sons are not really approachable on this topic. They do not realize what causes the chaos. What do you tell your family members about your life as far as mental health issues? How do you  or hurt your children with all of this?