Hi, trying to find grave and names of the paternal grandparents and mother of Dr Barnewall Peter White, c 1810- 1885, of St Columbs, Londonderry. In his 1885 will he mentioned having a granite slab and iron railing put round their graves in Glendermott graveyard. They were a catholic family, and his father was wealthy Londonderry merchant Thomas White. I think the grandfathers Christian name was Peter but can't be sure, and his mother died before 1825/1826 when Thomas remarried Frances Lucinda Mitchell.
Any suggestions as to how I might find this information greatly appreciated. I live in New Zealand so can't visit the graveyard in person.
Thank you,
Liz