He was diagnosed with leukemia when he was a baby in the early 1990s. He never interacted with the other Cul-de-sac kids because his parents thought he was too fragile to be around them, and he stayed bedridden for the rest of his life as a result. During this time, they also discovered he had Duchenne's Muscular Dystrophy. This is an incurable disease that affects the muscle tissue in the body, causing it to waste away until it dies. Due to its severity, they decided not to tell any of the other children on the cul-de-sac about Double D's condition. However, years later, after his death, their secrets came out. It turned out that all the other children on the cul-de-sac were actually born without legs! The doctors who treated Double D's parents during their pregnancies with an experimental drug that prevented the birth of disabled babies took this opportunity to amputate the limbs of all these healthy infants so they could try the treatment on them too. No one knew about this practice until many years later when some of the adults on the cul-de-sac started to die. The people who died included Triple A's father, who was beaten to death by his wife after finding out she was pregnant; and Double J's mother, who killed herself when she found out she was carrying triplets.