Mark is stressed out and feeling sick, convinced he has COVID-19; Becky and Harris team up to confront Josh who has been ghosting Harris.
Katie strives to keep her long-separated parents apart when her father, Marty, arrives in time to surprise the Otto family for Christmas.
Katie gets upset after discovering that the pin code the Otto's use spells out Greg's ex's name; the kids' current love lives take a hit.
Greg insists on doing the family's taxes; Oliver and Anna-Kat join forces in an attempt to win a popular radio contest.
Greg enlists Oliver and Anna-Kat’s help to drum up new recruits for the Historical Guild; Taylor dreams of becoming the next American Idol.
