For searchers who come later these are the MIs and relationships to this line in Norrrieston Churchyard/Burial ground. I'm still unable to find a death registered anywhere for John or Isobel (Doig) Stewart, still this may help others in their search.
#11. 1844, Isobel STEWART 20.9.1825 38, bro John STEWART 24.12.1850 77 (Musician on census),
Both are children of JOHN STEWART (shoemaker)/ISOBEL DOIG m 1768
(west side) Jas STEWART 1884, bro John 1887 (w Mary WOODROW 1902, s Jas 1912 )
1st 2 are sons James STEWART/Helen MITCHELL m 1816 and grandson Jas is Davie S the coalman's bro their parents being John S/Mary Woodrow/Woodroff
#64 by Mary and Helen MITCHELL imo bro Jas MITCHELL late mert Norrieston 2.2.1830 49,
This is Helen MITCHELL's (m JAMES STEWART 1816) BIRTH FAMILY
(West side) by David & Eliz (Sinclair) STEWART, chn: John 1879 1881 (age 2 Dunipace), David 1888 1918 (on war memorial), Mary 1886 1918 (Spanish flu victim death reg Dunblane), Chas 1896 1915 (on war memorial)
Davie the coalman's children
#95 Agnes BUCHANAN 15.4.1843 65, h Walter STEWART 18.6.1859 80
Walter 2nd son of John Stewart/Isobel Doig