Hi Heywood,
Thanks for your reply. Yes this search is very frustrating. The Cronnolly family tree that you saw on Ancestry or Roots web is mine. The information I put there about Mary Cronnolly's parents & siblings, isn't conclusive. There are three Mary Cronnolly's born in the time period that I think my great grand mother may have been born, which is 1837-1857. One Mary is born in 1850, the other two in 1854 & 1856, all in the Killasser Roman Catholic Church. Going thru a process of elimination, I found out that the Mary Cronnolly that was born in 1856, married a man named James Kenny, he isn't my great grand father. The Mary Cronnolly born in 1850, I can't find a marriage or death on, so far. Also the Mary born in 1850, her last name is spelled Clonnolly in the index, which I think is a typo mistake. I also will check the immigration records for this Mary.
Life would be easier if I could find my great grand parents civil marriage record.