Four generations back. I have a grandfather by the name of Valentine Dervine married to Katherine Gavigan. Valentine came from Co. Roscommon, Katherine came from Au clair, Co. Sligo. They met on a boat across the waters. They married in San Francisco. My mother has stayed with relatives decendent of Valentine and Katherine. If you would like more ifno. let me know. I am presently living in Burlington, Vt contact me at email@example.com.