On the first day of his visit, Matt gets a crash course in Quinn family dynamics when Don brushes him off and Kayla has a relationship crisis.
Drama swirls ahead of the family's traditional night of caroling as Joy catches Sean in a lie, Emmy questions Matt's career goals, and Don upsets Nancy.
It's the Sunday before Christmas, when the Quinn men watch football and the Quinn women decorate the tree. But this may be the year traditions change.
Don's quest for a last-minute gift means a family trip to the mall, where Kayla tries to chat up a barista, and Emmy and Matt squabble over finances.
As Don tries to rally the family for Midnight Mass, Patsy and Todd share big news, while Matt looks for signs about whether he should propose to Emmy.
On Christmas Day, Emmy eagerly awaits Matt's proposal, Don makes another misstep with Nancy, and Kayla rethinks her decision about her marriage.
Emmy learns the truth about her job opportunity, Matt endears himself to Emmy's siblings, and a nervous Don prepares for his big date with Nancy.
Reeling from the state of her relationship with Matt, Emmy calls out Don on his controlling behavior. Kayla opens up on New Year's Eve.