I don't have any solid data, Vicki, but I have encountered a theory by a descendant that Hugh married two different Marys. If the first Mary was born a good 10-12 years earlier than the traditional date given for Mary Hamilton, and the hypothetical 2nd Mary was the one whose maiden name really was Hamilton, that might make a lot more sense. Especially since the production of so many surviving children by only one woman over such a wide range of years does rather strain the credibility factor, given the rather poor medicine of the time. *IF* the theory is correct, I know of no one who has determined the date of the death of the hypothetical (but probable) first Mary and the marriage of Hugh to the 2nd. The answer to this particular puzzle may never been known unless more evidence surfaces to shed light on it.