Now, I am just saying this to any one in particular, and please don't take offence, but I don't think anyone should have a child unless they themselves are prepared to handle birth defects and other problems. I knew someone who gave birth to a child with a deformed back...child lived, but she put it in a foster program. Few months later, she's pregnant again...comes out with a healthy child, and keeps it. That angered me more than anything. But no, I don't believe you shouldn't have children if you have certain disorders in your familys background. No one would be able to have children, then.