Two days later her older twin brother, Terry, celebrated his birthday.

How can this be, assuming that the difference in twins' ages can be a few minutes, but not over an hour?

The above situation is possible when the mother in labour delivers the first child minutes before crossing the international date line from east to west in a ship or a plane and delivering the second child after a few minutes crossed, particularly on March 1 and after crossing the line Feb 28 or 29 if it happens to the leap year.

R.Kesavan.