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Maria (Mary) McNeeley is my 3rd g-grandmother. She is listed in the 1840 Federal Census in MA with my 3rd g-grandfather as well as subsequent censuses. I know that she emigrated from Ireland. Ancestry.com recently showed a NY Passenger List for 1836 with Mary being a passenger. The timeline is correct and her age matches as well. Is there any way that I can be 100% sure that the person on the passenger list is my 3rd g-grandmother?