Who founded the radio show that The Carter Sisters joined in 1950 ? 
Anita Carter: Ina Anita Carter (March 31, 1933 – July 29, 1999), the youngest daughter of Ezra and Mother Maybelle Carter, was a versatile American singer who experimented with several different types of music and played upright bass with her sisters Helen Carter and June Carter Cash as The Carter Sisters. Anita Carter:  The trio joined the "Grand Ole Opry" radio show in 1950 (Anita was 17 years old at the time), opened shows for Elvis Presley, and joined "The Johnny Cash Show" in 1971.
i don't know