Patrick Roland/Rowland, b. 1831

I'm looking for information on Patrick Rowland/Roland, born about 1831. His obituary says he is from County Galway. His death certificate only lists his father as also Patrick Rowland. His naturalization paperwork lists Roland as his last name. His profession was a tailor. I can first find him in Tuolumne County, California, in Columbia, working as a tailor, in 1860, then in 1868, in San Francisco. He mostly worked as a tailor in San Francisco until he died, but moved briefly to Mendocino, CA, then back to San Francisco. He died May 7, 1912. He married Bridget Flanagan/Flannigan, and had three children, Mary Ann, Thomas Joseph, and Henry Michael. I may have also found him in 1851 in Liverpool, working as a tailor, on the England Census. I'm trying to figure out who his parents and siblings where. I'm sorry I don't have a more specific part of County Galway- I know it's enormous!