The Grants - father Woody, mother Kate, and adult sons Ross and David - live in Billings, Montana. Aged Woody is approaching dementia, although the family likes to think that he solely believes what appears on the surface, Woody's delusions which are exacerbated by a lifetime of heavy drinking. The latest belief that Woody has is that he has won $1 million, which everyone in his family knows is one of those scams for people to purchase magazine subscriptions. As such, Woody, who does not trust the US postal service to mail in his "winning" certificate, is determined to walk to Lincoln, Nebraska, the headquarters of the company, to pick up his $1 million. All he really wants with the money is to buy a new pickup truck - something he's never had and despite the fact that he should no longer be driving - buy an air compressor to replace the one stolen from him decades earlier, and to leave a little legacy to Ross and David. Younger son David, an electronics salesman who has just broken up with his girlfriend and thus needs a distraction, agrees to drive Woody to Lincoln just to humor him, but not before making a stop in Hawthorne, Nebraska - Woody and Kate's hometown - for a family reunion, which will include news anchor Ross and acerbic tongued Catholic Kate in a few days. David does not want Woody to tell anyone in Hawthorne of the "$1 million", but news of such does get out. This news colors Woody and David's interactions with their relatives and old friends and colleagues, including with Woody's old business partner, Ed Pegram. But this time in Hawthorne is also an illuminating one for David, who learns much about Woody and why he is the way he has always been, and about his parent's relationship as it concerns himself and Ross.