The series starts as Jed Clampett, an impoverished and widowed mountaineer, is living alongside an oil-rich swamp with his daughter and mother-in-law. A surveyor for the OK Oil Company realizes the size of the oil field, and the company pays him a fortune for the right to drill on his land. Patriarch Jed's cousin Pearl Bodine prods him to move to California after being told his modest property could yield $25 million, and pressures him into taking her son Jethro along. The family moves into a mansion in wealthy Beverly Hills, California, next door to Jed's banker, Milburn Drysdale and his wife, Margaret who has zero tolerance for hillbillies. The Clampetts bring a moral, unsophisticated, and minimalistic lifestyle to the swanky, sometimes self-obsessed and superficial community. Double entendres and cultural misconceptions are the core of the sitcom's humor. Plots often involve the outlandish efforts Drysdale makes to keep the Clampetts' money in his bank and his wife's efforts to rid the neighborhood of those hillbillies. The family's periodic attempts to return to the mountains are often prompted by Granny's perceiving a slight from one of the "city folk".