Another dream visitation from Lynda inspires Syd to preserve the Hansens' holiday traditions. But first, a Christmas-tree mishap sends her on a long, strange trip in which she imagines the family's lives without her.

As Syd charms a younger man, Joanie finds passion of her own at a singles mixer. Meanwhile, sparks fly when Robbie moves in with Heather.

Syd investigates a mother accused of child abuse; Joanie frets over Hannah's admission to an exclusive preschool; Robbie woos Heather with a romantic dinner.