Source: daughter's marriage certificate.
The OAP/Census records (on EA) show:
1851 James GIBSON na Letterloan Macosquin
1851 Jane GIBSON na Letterloan Macosquin
1851 William GIBSON 17 Letterloan Macosquin
1851 James GIBSON 14 Letterloan Macosquin
1851 Ellen GIBSON 12 Letterloan Macosquin
1851 Mary Jane GIBSON 10 Letterloan Macosquin
1851 John GIBSON d. 1836 Letterloan Macosquin
1851 Samuel GIBSON d. 1838 Letterloan Macosquin
1851 Margaret GIBSON d. 1838 Letterloan Macosquin
A James Gibson is the tenant of House 6g (no land, value 15 shillings) in Letterloan in the Griffiths Valuation. This man disappears perhaps in 1862, perhaps later, and no-one replaces him in House 6Ag in Letterloan, which then totally vanishes. Another James Gibson lives in 22c. THis house is also scored out in 1885 and described as "down".
Barbara Braswell also found his daughter, Nancy, checking his entry in the 1841/51 censuses in Letterloan for Old Age Pension purposes.
There is no record of any births to any Gibsons in 2nd Dunboe Presbyterian Church, so I do not know where this family worshipped.
A search of the 1831 Census films at Derry FHC found that Letterloan (and a dozen other townlands in Macosquin) was missing.
He was living in Letterloan at the time of his death in 1878 but PAD was his daughter, Ellen Gibson McKeown, also from Letterloan, so he may have been living in her house.
There are NO Gibsons in the townland of Letterloan in the 1901 Census.