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It was 1969, and 8-year-old Amy Grappell thought her house was haunted. She’d seen shadows pass her bedroom door in the dark of night. Once, she was sure she’d heard a ghost; the stairs creaked as if the specter were walking in the hallway. Amy mustered some courage and got out of bed. A strange man was coming out of her mother’s bedroom. Was he real? Their eyes met.

Rather Than Divorce, Two Couples Tried a Group Marriage. It Didn’t Work. - The Atlantic