. >> born of hardy iowa farmer stock, dave seems as indestructible as those tractors. assumes he'll plow on forever. then, all of a sudden, in the summer of 2011, his 73-year-old body grinds to a halt. >> dad was a man who never complained. he was only sick for a few days. we did not even know what was wrong with him. the autopsy results came back that we found out that he had cancer. [ voice breaking ] i'm sad because my dad's gone. sorry. >> it was more than just a shock. it was a life-changing blow. >> he went to the same church from the day he was born until the day he died. he was baptized and had his funeral in the same small country church. it was very important to him that we all knew that legacy and continued that on, also. >> at first, life on the farm continues as before. dave's son-in-law, alex's dad, todd popken, farms the acreage. alex tends the tractors. but soon, the loss of their patriarch sends ripples of change through the family. dave's widow, judy, moves into town. >> did that surprise you? >> no. mom had said for 10 years, "if something happens to

. >> born of hardy iowa farmer stock, dave seems as indestructible as those tractors. assumes he'll plow on forever. then, all of a sudden, in the summer of 2011, his 73-year-old body grinds to a halt. >> dad was a man who never complained. he was only sick for a few days. we did not even know what was wrong with him. the autopsy results came back that we found out that he had cancer. [ voice breaking ] i'm sad because my dad's gone. sorry. >> it was more than just a shock. it was a life-changing blow. >> he went to the same church from the day he was born until the day he died. he was baptized and had his funeral in the same small country church. it was very important to him that we all knew that legacy and continued that on, also. >> at first, life on the farm continues as before. dave's son-in-law, alex's dad, todd popken, farms the acreage. alex tends the tractors. but soon, the loss of their patriarch sends ripples of change through the family. dave's widow, judy, moves into town. >> did that surprise you? >> no. mom had said for 10 years, "if something happens to

. >> born of hardy iowa farmer stock, dave seems as indestructible as those tractors. assumes he'll plow on forever. then, all of a sudden, in the summer of 2011, his 73-year-old body grinds to a halt. >> dad was a man who never complained. he was only sick for a few days. we did not even know what was wrong with him. the autopsy results came back that we found out that he had cancer. [ voice breaking ] i'm sad because my dad's gone. sorry. >> it was more than just a shock. it was a life-changing blow. >> he went to the same church from the day he was born until the day he died. he was baptized and had his funeral in the same small country church. it was very important to him that we all knew that legacy and continued that on, also. >> at first, life on the farm continues as before. dave's son-in-law, alex's dad, todd popken, farms the acreage. alex tends the tractors. but soon, the loss of their patriarch sends ripples of change through the family. dave's widow, judy, moves into town. >> did that surprise you? >> no. mom had said for 10 years, "if something happens to