Cheryl and Corrina Thinn were almost joined at the hip. The sisters, both members of the Navajo Nation, shared an office at Tuba City Regional Health Care in Arizona. Cheryl conducted reviews to make sure patients were receiving adequate care. Corrina was …Cheryl and Corrina Thinn were almost joined at the hip. The sisters, both members of the Navajo Nation, shared an office at Tuba City Regional Health Care in Arizona. Cheryl conducted reviews to make sure patients were receiving adequate care. Corrina was …