Stevie,
Link to previous post:
https://www.irelandxo.com/ireland/tyrone/ardstraw-tyrone/message-board/…
I can’t help with graves as I don’t know the area well enough to be able to say. Perhaps someone with a better knowledge of the area may be able to help. If not, ask locally. The Church of Ireland does keep burial records though, so if you check locally as to which church they might have attended, then you could contact the Rector/Vicar and search the records. Make an appointment in advance. (There is normally a fee for searching Church of Ireland records held by the parish). Here’s a link to the current Rector in Ardstraw:
https://www.ireland.anglican.org/find-a-church/parish/11040/ardstraw-st-eugene-newtownstewart
Tradition was for a bride to marry in her local church (after which she’d attend her husband’s). So if you find the church the family attended, you could also check the marriage registers for any marriage for Sarah. You could also go through all the Sarah Wilson marriages in Northern Ireland on the GRONI site but that’s a lot of marriages. I did search 1911 – 1925 in Strabane registration area (which includes Kilstrule), and only found one. She was illegitimate and did not know her father’s name; she married William John Logue on 2.10.1917 at Magheramason Presbyterian church, Co Tyrone. She was a farm servant in Co Derry. So wrong denomination and wrong geographic area.
https://civilrecords.irishgenealogy.ie/churchrecords/images/marriage_returns/marriages_1917/09760/5542640.pdf
So I don’t think your Sarah married in the Kilstrule area, at least not up to 1925 when she would have been around 40. So either she remained single (and the 1939 Register may tell you that) or she moved away. In which case she may prove difficult to find.
Death certificates are on-line to 1966 on the GRONI site. However with such common names and until you have some idea when they died, it would be an expensive search.
Local enquiries around Kilstrule may also assist with the graveyard. People are not always buried in the graveyard associated with the church they attend. Some have family plots in other graveyards and some used publicly owned graveyards. Not everyone could afford a gravestone and not all graveyards have burial records, though most do by the 1950s. You may need to try several graveyards.
As far as local records are concerned, Northern Ireland doesn’t have county records offices. Most records are stored centrally in PRONI in Belfast (save obviously for recent church records which are held by the Rector).
You may be able to work out how long Charles lived in Kilstrule by checking the more recent Valuation records. The records up to 1929 are on-line and show him (and a John) there then. There are records that take that data forward from about 1935 up to the 1960s. They are in paper format in PRONI, in the VAL/3 series of records. They should show when the house changed tenant/owner or became unoccupied.
If you think Charles & Sarah were still living in Kilstrule in 1939 you might also ask for information on them from the 1939 Register. The 1939 Register was a sort of census compiled across the UK at the outbreak of the war, to assist with conscription and issuing ration books etc. That should show if Charles had married, for example, and the names and dates of birth of any dependents. The 1939 Register for Northern Ireland is held by PRONI. You need to apply under the Freedom of Information Act to obtain information from it, as many people in it are still alive, and so the records are closed. However they will generally release records to next of kin, upon production of a death certificate or if the person is over 100 (and so may be assumed to be dead). The latter should apply in your case. You should apply well before your visit, as it often takes several weeks to get a decision. But if approved they should have the data ready for you when you visit next month. You can make a request via the PRONI website.
Probate abstracts up to about 1966 are on-line on the PRONI wills site. However I don’t see any files for Wilsons of Kilstrule. If you find your ancestors died elsewhere, there are 23 probate files for people named Charles Wilson who died after 1911, and 73 for Sarah Wilson. So you would need to know where they lived when they died, to narrow it down.
https://www.nidirect.gov.uk/proni
Dealing with a minor point in your message of 29th Jan 2017, the informant to the birth of James Wilson on 4.7.1877 was Ann Glass. In the 1800s, good script used a long S for the first s in a double ss word. I note that the informant and mother were in Newtownstewart then. This is the only Glass family I can see in Newtownstewart in the 1901 census:
http://www.census.nationalarchives.ie/pages/1901/Tyrone/Newtown_Stewart/Main_Street/1752000/