This as-told-to essay is based on conversations with Martin Odum, 71, and his grandson, Noah. Odum is raising Noah with his wife in central Illinois. He previously raised his granddaughter and now cares full-time for Noah, who has spina bifida. This interview has been edited for length and clarity. We live in a little town in Illinois called Seneca in a mobile home, where we've been for four decades. My wife, now 74, and I have been married for 51 years. I worked as an electrician and retired