Shaw's of Fourmile House

Thomas Shaw married Margery Clendinin/Clendenon/Clendenan & variants on 13 Nov, 1816 in Clough Presbyterian Church, Loughinisland, County Down.  Thomas may have been from Killinchy.  By 1825 the family was residing in Aughintober townland, Donaghmore Parish, County Down.  Their [first known] child Margaret Shaw was baptized in the Donaghmore presbyterian church, as well as sons John Shaw in 1827 and Hugh Shaw in 1829. Fourmile House is the residence given on the baptism register. Additionally, DNA evidence suggests they may have had a child Margery born about 1833 and Eliza 1834/35 (my Great-Great-grandmother). Thomas Shaw shows up in the 1829 Tithe Valuation of Aughintober townland, Donaghmore, but by 1836 only a Mrs. Shaw is listed, suggesting Th9mas Shaw died on or before 1836. Margery is believed to have remarried a Joseph Mitchell and had two more children Isabella and Joseph Jr.  Isabella was baptized in the Donaghmore Presbyterian church in 1837, their residence is given as the adjacent townland of Maddydrumbrist.  The Mitchell family and the youngest Shaw children came to Canada.  Can anyone tell me where I would look to find a burial for Thomas Shaw sometime between 1833 and 1836 and his wife’s remarriage between 1836 and 1837?  Could there be older children?   I have checked the Donaghmore Presbyterian Registers for baptism (I804-1900) and marriages (1846-1900), but have found no further information on the family. I would be delighted to correspond with anyone that descends from this family or can help with the above questions. Thank you.