I am researching my family tree and I am severely stuck. I can get to Cornelius O'Malley/Malley/Maelly b. 1865 in Ireland d.1937 in Illinois, married Katherine Elizabeth Cool in 1900 in North Dakota. I know Cornelius' parents were Daniel O'Malley/Malley and Ellen O'Dwyer. I do not know any more names but I do know there were children other than Cornelius. From what I can tell from the stories and information I do have, Cornelius was the only transplant from this family when he came over in 1880. I am unsure if there were other children who left Ireland later or not.
I know substantial parts of Cornelius' story but I am unable to trace things back any further. Any tips on where to look (especially since these names seem to be popular during this time frame) or has anyone traced this line back already that could help?