The John Doyle I am referring to is the father of John R. Doyle. I do know that John's wife's name was Mary and that she was called Polly, maiden name unknown.On what do you base the supposition that Mary was the sister of Richard Pratt? I have Nancy Jane's complete family line but just a few facts on the other children. Would like to exchange any information with you so as to help each other. I have some information further back on the Doyle line but you may not be interested since you are researching Pratt. Barbara