It's wonderful to hear that you will be over with us next year and looking to meet up with any relatives here.
We were having a good look at the maps and thought maybe it is Lisnalee
, Mountnorris, and Newry you would be looking for as Lisnalea is in County Cavan?
The National Archives of Ireland
1911 census has Uncle Harold as 5 years old in Lisnalee as well as your granny Annie as 13. The area is very rural so the number of houses is small and if there are any relatives still in the area a quick visit will find them for sure!
There is a post office and pub in Mountnorris, always great places to find information on local residents. There is also the Presbyterian Church which seems to be the closest and just along the road from the Primary school
Hopefully, a visit to the area will be fruitful in finding any living family.