I am a relative of Sinon O'Gorman.
Sinon was one of several children of John O'Gorman and Mary Foley. Mary and John were both widowers when they met and married. John's first wife was Johanna McGuire and they had Brigid, Mary, Margaret, John, Patrick and Nara.
With Mary John had Thomas, Daniel, Michael, Peter, Sinon, James, Timothy, Ellen.