Your mention of James Font is interesting.
A John Font (born abt 1840) married a Catherine Rooney in Dublin, Ireland abt 1866.
Their eldest was James born in 1867.
The family emigrated to Newcastle-on-Tyne, England shortly after and had children John, Mary Ann, Francis, Patrick, Catherine (and possibly Michael).
In the 1881 census, I have found this family. Mary Ann died young
Kate Rooney, the mother dies about 1882 aged 40.
John the husband, may have remarried and eventually died in 1916.
Patrick, the son fought in WWI, there is a mention in PRO WWI records in Kew, London. He died in 1922.
Francis died in 1916. Catherine died in 1922.
THis family tree died out with John the son when he died in 1943.
Returning to the 1881 census for this family, the son James is missing from the list, he has disappeared. Could he be to do with your family?