Just the Ten of Us - Season 3 Episode 17 Snow Job (2)

To recap, the girls snuck off to the beach with Gavin Doosler, instead of partaking in the annual ski trip. Marie was told that Gavin was dying, and Gavin was told that Marie had a crush on him. So when the two realize that neither has the same intentions for their trip, they decide to pay back the three decietful sisters -- they pretend to be in love. Back at home, Graham and Elizabeth freak out after Sister Ethel tells them that the girls never arrived. (Part Two of Two)