Dee
                    
                    
                    
                    
                    
                    
                    
                        
                        
                        My nefew has this condition. He was diagnosed with last week, 9 months old.  My brother was told that it was inherited from him or his wife. This is the first I heard of this and would like more information on this. How far back in the family tree would one have to go to detect this? No one in our family has this but him. The wife's family either.