Read the excerpt from "The Medicine Bag.”My kid sister Cheryl and I always bragged about our Sioux grandpa, Joe Iron Shell. Our friends, who had always lived in the city and only knew about Indians from movies and TV, were impressed by our stories. Maybe we exaggerated and made Grandpa and the reservation sound glamorous, but when we’d return home to Iowa after our yearly summer visit to Grandpa, we always had some exciting tale to tell. . . .We never showed our friends Grandpa’s picture. Not that we were ashamed of him, but because we knew that the glamorous tales we told didn’t go with the real thing. Our friends would have laughed at the picture because Grandpa wasn’t tall and stately like TV Indians. His hair wasn’t in braids but hung in stringy, gray strands on his neck, and he was old. He was our great-grandfather, and he didn’t live in a tepee, but all by himself in a part log, part tarpaper shack on the Rosebud Reservation in South Dakota. So when Grandpa came to visit us, I was so ashamed and embarrassed I could’ve died.