Season 5: Episode 106: Fighting In-Laws
While celebrating Thanksgiving, Debra discovers that her seemingly contented parents are really not very happy with each other. When Ray accidentally overhears his in-laws going at it with each other, he relays the news to Debra... who has always believed her parents' relationship to be a lot healthier than Frank and Marie's. But, when things come to a head at the Thanksgiving table, it's apparent that there really isn't that much of a difference between the two older couples--much to Debra's dismay.