The Mormon sisters from Idaho Falls, Idaho, ended up vying for the fifth spot with kite-flying Connor Doran in the last moments of the show Wednesday, Aug. 25.
The trio of judges did a tie-breaker of sorts with Piers Morgan and Sharon Osborne voting to move the sisters to the finals and Howie Mandell supporting Connor, a high school student who has epilepsy.
Ali, 20, and Christina, 13, both have cystic fibrosis and were told arly in life they would never sing in public because the disease would restrict their breathing. Their sister passed away last summer.