A miserable man who doesn't believe in the holidays must contend with his 11 children and wife celebrating the most wonderful time of the year.

With the occasion all but overshadowed by her sister's upcoming wedding, angst-ridden Samantha faces her 16th birthday with typical adolescent dread. Samantha pines for studly older boy Jake, but worries that her chastity will be a turnoff for the popular senior. Meanwhile, she must constantly rebuff the affections of nerdy Ted, who is unfortunately the only boy in school who seems to take an interest in her.

A boy who lives at a country club where his father works decides to make some extra money by selling composted horse manure as fertilizer, and has his three sisters (two of which are older) join him in the enterprise. As their sales increase, they draw increased scrutiny from the IRS and state tax board, as well as the large scale competitor who seeks to put them out of business at any cost.