When the cousins were children, all four of their parents were slaughtered during the "border wars" just before the Civil War (q.v. Kansas-Missouri Border War) ("The Men That Corrupted Hadleyburg", season two, episode 17). In "The Man Who Broke the Bank at Red Gap," Heyes remarks, "My cousin and I are not Hannibal Heyes and Kid Curry." Curry also speaks of their "sage old grandfather." In the first episode with Davis, "The Biggest Game in the West" (season two, episode 19), Heyes shouts to Curry: "Yes sir! Cousin, you're all right!" In the episode "Don't Get Mad, Get Even," Curry and Heyes both make reference to their Irish grandfather Curry.