I was just thinking when I realized that Sam is like Joe, Lyle is like Junior, Pauline is like Angie, and Melanie is like Norrie. Sam and Pauline are siblings like Joe and Angie. Lyle and Junior aren't right in the head. Lyle was dating Pauline, the past sister, and Junior was dating Angie, the present sister. Angie and Pauline both died or were thought to have died. Melanie was dating Sam, the past brother, and Norrie was dating Joe, the present brother.