Mary FAY born NY 1799

     I have information on my 3rd great grandmother was Mary FAY born 10 Sep 1799 in Kingsbury, NY, daughter of Paul FAY and wife Sarah ALLEN. Mary married Timothy Hyde KING 15 Sep 1833 in Cicero, Onondaga, NY. I do not have a listing of her siblings and no dates on her parents.
    My question is this, is this Mary FAY the daughter of Paul FAY in the O. P. FAY book called Polly daughter of Paul FAY he was married to two different Sarah's but neither one with the surname of ALLEN, was there a 3rd wife or was one of the two Sarah's married before Paul?
    I feel sure that my Mary and the Polly in the said book are the same person, but not sure how to prove this, I could sure use some help.
    I look forward to hearing from you.
        Dianne in Michigan