Defying all the odds, identical twin sisters Kerri Bunker and Kelli Wall from Utah, gave birth to sets of twins for the second time each. Wall gave birth to her pair eight weeks early and Bunker's arrived a month before their due date. Each set of twins and their mothers are doing great and are perfectly healthy. Bunker admitted that she and her husband were in shock when they heard the news. Wall and her husband wanted another child and couldn't believe she was having doubles again.