John O'Brien married Mary Ann Dugan sometime in the early 1800's, but before 1870 in Ireland. Both were born in Ireland. I only know of one child that they had, my Great Grandfather Patrick O'Brien. He was born in Ireland sometime around 1865-1870. He came to America in 1888. I am wanting to know more information about John and Mary Ann. I believe them to be from County Clare, possibly Killaloe. But, I have not confirmed this, other than knowing that Patrick was born in Killaloe. If any of these names and times sound familiar please let me know. Thank you.