After searching on the subscription site Roots Ireland in Co. Waterford and not finding any records for children of James Dunphy and Mary Hagan, I looked at the 1901 census record for the family. All family members were born in Co. Kilkenny.
I then went back to Roots Irelandand and found records for the children. However, the mother was Mary Rowe not Mary Hagan.
it appears John was born in late 1893. I will have records for you tomorrow when I have better access to www.irishgenealogy.ie