While both couples, Annie and Eric---Patricia and Morgan Hamilton spend a romantic Valentine's Day camping, Matt is left in charge of the rest of the family and allows chaos to reign in the Camden household. His preoccupation with his date and Mary's party allows the dog Happy to slip out of the house in search of her puppies. When a car hits Happy the family holds a vigil, aided by a caring veterinarian. Simon blames Matt for the whole entire accident. Meanwhile, Lucy is enjoying her first Valentine's Day with her boyfriend Jimmy Moon.