Ron and Nellie Biles, Simone's grandparents, react as the U.S. wins gold in the women's team final on Aug. 9. At right is Simone's sister Adria Biles.
Simone Biles was born in 1997 in Columbus, Ohio. By the time she was three, it was clear that her biological mother, who struggled with drug and alcohol addiction, was unable to take care of Biles and her younger sister Adria. Ron and Nellie, stepped in and brought the pair to Spring, Texas, a suburb of Houston--and sixteen years later, they're simply "mom and dad" to their adopted daughters.