I wanted to add, I looked over your tree and the only possiblity I can see is if your Micheal Cronin born 1820 were the brother of my James Cronin, born about the same time frame. But James is as far back as I've gotten and I don't know much about him. Only that he married Mary Hurly and are the parents of my Daniel Cronin who came to New York abt late 1860's. Daniel married Ellen Donovan in Manahattan, 1871. I know for sure of three children: Mary b. 1875 who married a Thomas Lennon, Daniel b. 1882, Robert b. 1888 who married Katherine Veronica Murtaugh. I suspect they also had children named Nellie, James and Annie. Robert and Katherine are my g gp's.