Life’s good for deliveryman Doug Heffernan, until his newly widowed father-in-law, Arthur, moves in with him and his wife Carrie. Doug is no longer the king of his domain, and instead of having a big screen television in his recently renovated basement, he now has a crazy old man.
Doug decides to spend the Heffernans' tax refund on an ice cream truck. Meanwhile, Carrie fills in as a pretend mom at model homes, and discovers a reemergence of her maternal desires.
Doug panics when he starts getting sexy phone messages meant for another Doug Heffernan, but Carrie doesn't seem to care. Meanwhile, Danny tries to force a wedge between Spence and a new lady friend.
Doug and Deacon fill in for Supervisor O'Boyle at the IPS depot. Carrie regrets her decision to complain about her company's chinzy gift for work on an important project.
The Palmers' vacation plans are ruined when Doug frightens Major so much that he refuses to be babysat by the Heffernans. In the meantime, Arthur begins hiring out himself and friends from the senior center to ride with solo drivers so they can use car-pool lanes.
Feeling hurt over not being invited to a block party, Doug adopts a dog just to prove to the neighbors that he's an okay guy-a decision he soon regrets. Meanwhile, Arthur falls prey to the gambling bug when trying to help Danny beat it.
An unflattering picture by Major prompts Arthur to ask Doug and Carrie for braces. Meanwhile, Kelly hires an out-of-work Spence to help out around the house.
Carrie is convinced that Deacon and Kelly were only able to afford a vacation home by being cheap. Meanwhile, Arthur tries to help Spence get a new job.
Carrie soon grows tired of Doug's forcing his new vegetarian lifestyle down her throat. Meanwhile, Carrie's boss wants to start discussing novels with her and Spence takes on some humiliating new jobs.
Doug's 20th high school reunion seems like a dud until an old friend comes up with a way to retaliate for a past grievance with their old principal.
Carrie's ecstatic when an affordable apartment opens in Manhattan, but Doug's reluctant to leave Queens. Arthur meets singer Ava St. Clair.
Seeing friends who recently had a child makes Doug and Carrie consider adopting.
Doug and Carrie's marital tension continues, as they ponder whether they have a future together. Arthur and Ava's wedding day turns problematic.
At Arthur's wedding reception, Doug and Carrie's marital tension continues, and they ponder whether they have a future together.