The revaluation records show Joseph Foster on plot 8 (a 12 acre farm) until 1882 when Francis replaced him. That usually indicates that Joseph had died. (There?s a death regd in Armagh for a JF who died in 1881 and who was born c 1797, so that might be him). In 1914 the farm was purchased under the Land Act (previously it had been rented). In 1922 Edward Foster replaces Francis, again indicative of Francis? death. Edward?s name remains against the property in 1929 when that series of records finishes. (There are later records in PRONI up to the 1960s but they are not on-line).
There are no Fosters listed in Drumharriff in the 1901 or 1911 censuses, suggesting they lived elsewhere.
The revaluation records show Robert McKeever on plot 20 in Annahugh (a 6 acre farm) until 1883 when briefly Robert Johnston is the tenant. In 1884 it reverts to Robert McLelland. In 1899 it changes to Hannah McLelland then in 1902 to Hannah McKeever, suggesting probably that following Hannah?s death the farm had been sold.
Here?s Hannah McClelland in 1901:
http://www.census.nationalarchives.ie/pages/1901/Armagh/Kilmore/Annahugh/1018173/
There was another McClelland farm (plot 26) nearby who may be related:
http://www.census.nationalarchives.ie/pages/1901/Armagh/Kilmore/Annahugh/1018193/
Here?s the other McLelland farm in 1922:
http://www.census.nationalarchives.ie/pages/1911/Armagh/Kilmore/Annahugh/330010/
Some probate abstracts for one of the McLelland families (I could find none for the Fosters).
Probate of the Will of David M'Clelland late of Annahugh County Armagh Farmer who died 3 April 1900 granted at Armagh to Richard M'Clelland Farmer and John M'Clure Merchant. Effects ?531 13s. 6d.
The above will is on-line on the PRONI site.
http://applications.proni.gov.uk/DCAL_PRONI_WillsCalendar/WillsSearchResults.aspx
Administration of the estate of Richard M'Clelland late of Annahugh County Armagh Farmer who died 8 May 1903 granted at Armagh to Caroline J. K. P. M'Clelland the Widow. Effects ?623 15s. 4d
McClelland, Richard Hamilton of Annahugh House Loughgall county Armagh farmer died 11 July 1962 at Banbridge Hospital county Down Probate Belfast 11 January to Donald Ridgwell Cable chartered secretary. Effects ?20786 3s.
For graveyards, I would start with Loughgall Church of Ireland but sometimes families had plots in other churchyards, not necessarily the church they attended. You would probably need to make local enquiries about that.
The Church of Ireland does keep burial records (though not every burial seems to make it into the records). This is what PRONI holds:
Baptisms, 1706-29, 1779-1820 and 1830-86; marriages, 1706-29 and 1779-1845; burials, 1706-29 and 1779-94; publication of banns, 1815-30; confirmations, 1828-63; vestry minutes, 1774-1885. Later records still with the church.