Hi Carol
If your G Grandparents are Patrick & Mary Furlong residing in Castle Hill St in 1911 but no longer there in 1936 then could this be them?
It's the details taken from a Grave headstone in St Ibar's cemetery (see Seanmacs initial post in the topic heading "St Ibar's Cemetery - Wexford Town" )
If your father had Rossiter Cousins then it's an even stronger possibility.
Mary Furlong, 5 Castlehill st
28/11/1927
hus, Patrick; 8/1/1934
grand-dtr, Marie Rossiter, 55, Whiterock view
11/2/1945 (12)