 In addition to the differences between their treatment of others, as well as their conflicting views on morality, another reason for J.R. and Bobby's rivalry was their father's preference for Bobby (their mother, Miss Ellie, favored second son Gary).Growing up, and even into adulthood, Jock made no secret of the fact that Bobby was his favorite son and Bobby was very dependent on Jock's support in his fights with J.R.This caused a major rivalry with J.R., who was jealous of the unearned favoritism Bobby got from Jock.