I just noticed your posting here.Hopefully you have already found the info on your John McManaman. If not, you might want to look at the very bottom post from Kevin McManaman who has extensive knowledge of my McManaman lineage.Please note the following from his post:
3. GRACE2 MCMANAMAN (JAMES1) was born December 26, 1840 in The Valley, Achill Island, County Mayo, Ireland7, and died October 30, 1915 in Lincoln, Nebraska. She married PATRICK MCMANAMAN in Dugort, Achill Island, County Mayo, Ireland, son of JOHN MCMANAMAN and CECILIA O'MALIA. He was born May 25, 1834 in The Valley, Achill Island, County Mayo, Ireland8, and died October 15, 1914 in Lincoln, Nebraska.
I am wondering if your Robt Francis could have been a decendent or brother of my ggrandfather, John McManaman.