Thomas Hubert Farr, aka Hugh Farr, was born 6 December 1903, Llano, Texas, USA, and died 17 March 1980. He was an important member of the Sons Of The Pioneers.

http://www.allmusic.com/artist/hugh-farr-mn0000111936

Karl Marx Farr was born on April 25, 1909, in Rochelle, Texas and died on 22 September 1961. He played guitar for the Sons of Pioneers. 

http://www.bobnolan-sop.net/Biographies/The%20Story%20of%20SOP/Karl%20Farr/Karl%20Farr.htm