Jacks brother died I think, I think he died in the plane crash years, I dont know if he had any children, hey he could out of wedlock.
I agree the Sugdens as farmers is just plain wrong, but Butlers was Andy and Katies farm, not the Sugdens, Emmerdale Farm was the Sugden farm but Jack had financial difficulties, leading Andy to burn the Barn down.
I wonder who runs Emmerdale Farm as Andy could possibly run that when he recovers from his depression, but he DOES need someone to help him, I still say bring Daz back