James Grant , likely father of John, grandfather of Catty born ~1768?
All records below found on RI . No Grant records on irishgen Church records 1780-1863
Could trawl through the original registers on NLI records
1768 & 1769. Baptisms of James Grant in Waterford to James Grant & 1. Anastasia Power in Trinity Within & 2. Brigid Welsh in St Patricks
No marriage of a James Grant to Catherine Flynn/Fling 1790-1799 in Waterford /Kilkenny, but there are ~ 6 James Grant marriages in just Waterford -RI
1799. Mary Grant baptised to James Grant & Catherine Fling. 18/10/1799 Trinity Without, Waterford . sponsor Anastasia Fling
& Anastasia Fling married James Crow 1804 in Trinity Without, withesses James & Catherine Grant
so reasonable to assume that James married Catherine around Waterford
Margaret Fling married James Collins in 1801 Trinity Without, Patrick Grant a witness
1803.Margaret Grant baptised to James Grant & Catherine Fling 16/9/1803 Trinity Without, Waterford . sponsor Patrick Fling
1805. John Grant baptised to James Grant & Catherine Flynn 12/6/1805 Trinity Without, Waterford .or to Patrick Grant & Ellen Power in 1811. RI
1809. Edmond Grant baptised to James Grant & Catherine Flinn 29/8/1809 Trinity Without, Waterford .
John does call his daughter Catherine, but, on the other hand, does not seem to name a son James!