That if i did not wear my hood, i could die from skin cancer. >> having a child with such a serious disease made it hard for jennifer and todd to think about having another child. and they didn't, for five years. but as they saw paris thriving as a young girl, despite her limitations, they began to think again about their dream of a big family. >> i don't know. we just -- we always knew we wanted more than two. >> the couple got advice from a geneticist. since both mom and dad carry a defective recesssive gene, the doctor said their children have a one in four chance of having xp. >> basically...