Their mum was on a ship heading east across the Pacific. Terry was born just after midnight on 1 March in an ordinary year. Then the ship crossed the International Date Line and the calendar went back a day, so Kerry, born minutes later, was born on 28 February. In a leap year, the 29th sits between their birthdays.
Kerry celebrated her birthday, and two days later her older twin brother, Terry, celebrated his. How?
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Where were they born, and at what time of year?
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They were born at sea, either side of the date line
Source: Traditional, from the rec.puzzles lateral thinking collection