Jack Bartlett is the rock of Heartland, anchoring the family through all the ups and downs of their increasingly complicated lives. His world changed overnight when his daughter Marion died and he was left to run Heartland and look out for his granddaughters Amy and Lou. Jack has also become like a father figure to Ty - who he treats more and more as though he were a son. Jack and Lisa still struggle with whether or not their future happiness lies in a marriage. But they both decide they're happy with things exactly the way they are... at least for now.