Premise: Billy Clanton . He , along with his father Newman Clanton and brother Ike Clanton , worked a ranch near Tombstone and stole livestock from Mexico and later U.S. ranchers . Joseph Isaac `` Ike '' Clanton ( 1847 -- June 1 , 1887 ) was a member of a loose association of outlaws known as the The Cowboys that clashed with lawmen Wyatt , Virgil and Morgan Earp as well as Doc Holliday .
Hypothesis: Billy Clanton had an older brother.
Label: ENTAILMENT