<Ul> <Li> Shaun Johnston as Jackson "Jack" Bartlett </Li> </Ul> <Li> Shaun Johnston as Jackson "Jack" Bartlett </Li> <Dl> <Dd> The family patriarch, Jack is Amy and Lou's grandfather and was Marion's father . He is a former rodeo star and was once a cattle rancher . When Marion took over, Heartland became a horse ranch . After her death, Jack helps Amy and Ty maintain Heartland and its horses and is the one who fixes broken equipment, fences, and the like . Early in the series, he was very hostile towards ex-son - in - law Tim . The men have maintained a difficult relationship stemming from Tim's troubled past with alcohol and prescription drug abuse, his acrimonious divorce from Marion, and lack of involvement in Amy and Lou's lives . Jack seems to barely tolerate Tim's presence at times, and they've had numerous arguments over the running of the ranch . Jack was also initially hostile towards Ty . He warned Ty to keep ten feet away from his granddaughters at all times, and that any part of him that crossed that line would be removed . Later, he comes to accept Ty like a son and shows a great deal of concern and paternal affection for him . When Ty seeks permission from Jack to ask for Amy's hand in marriage, Jack gives him his blessing . In terms of personality, Jack is very stubborn and reluctant to accept change of any kind . This trait sometimes causes friction between him and others, most notably his romantic interest, Lisa Stillman, and with his granddaughter Lou . In season 7, Jack finally asks Lisa to marry him, and she says yes . They elope in the season 7 finale . Jack also suffers from heart problems after having a heart attack . When Jack is missing one episode after collapsing in the fields, Tim is the one to find and save him . Jack dotes on his two great - granddaughters, Katie and Georgie . </Dd> </Dl> <Dd> The family patriarch, Jack is Amy and Lou's grandfather and was Marion's father . He is a former rodeo star and was once a cattle rancher . When Marion took over, Heartland became a horse ranch . After her death, Jack helps Amy and Ty maintain Heartland and its horses and is the one who fixes broken equipment, fences, and the like . Early in the series, he was very hostile towards ex-son - in - law Tim . The men have maintained a difficult relationship stemming from Tim's troubled past with alcohol and prescription drug abuse, his acrimonious divorce from Marion, and lack of involvement in Amy and Lou's lives . Jack seems to barely tolerate Tim's presence at times, and they've had numerous arguments over the running of the ranch . Jack was also initially hostile towards Ty . He warned Ty to keep ten feet away from his granddaughters at all times, and that any part of him that crossed that line would be removed . Later, he comes to accept Ty like a son and shows a great deal of concern and paternal affection for him . When Ty seeks permission from Jack to ask for Amy's hand in marriage, Jack gives him his blessing . In terms of personality, Jack is very stubborn and reluctant to accept change of any kind . This trait sometimes causes friction between him and others, most notably his romantic interest, Lisa Stillman, and with his granddaughter Lou . In season 7, Jack finally asks Lisa to marry him, and she says yes . They elope in the season 7 finale . Jack also suffers from heart problems after having a heart attack . When Jack is missing one episode after collapsing in the fields, Tim is the one to find and save him . Jack dotes on his two great - granddaughters, Katie and Georgie . </Dd>

When do jack and lisa get married on heartland