My GGGrandparents John and Ann Dunnigan McNamara had a son, my GGrandfather John Edward McNamara b. 1873 in Holland, Erie County, New York. John was born in Australia and may have been an ex-convict. Ann Dunnigan was born in Ireland. Not sure of other children. I have found some potential matches in 1860 and 1870 census in Buffalo, NY. Not convinced that it is the same John and Ann McNamara. Date of birth for son, John, doesn't match up to 1873. I have his death certificate so I know that his birthdate is correct. Any help appreciated.