Hi Christine sorry I do not have any old Galloway stones in Markinch Cemeteries
it looks like some of their children were buried in Markinch Church Cemetery
in the early 1800s 
GALLOWAY, ISABELL (6m): dau of Thomas Galloway in Markinch;
6 March 1814; 1 grave breadth from left side of
GALLOWAY, MARY (1): dau of Thomas Galloway at Balbirnie-mill;
28 Sep 1820; in grave of sister, Isabell Galloway, int
GALLOWAY, MARY (7): dau of Thomas Galloway at Woodside;
14 April 1835; in their north-most grave, next to the
Thomas Galloway & Isabella Welch married 24.1.1813 Leslie
they had a number of children, do you know who any of them married?
From Family search all born in Markinch
Andrew Galloway 28.12.1815 still alive in 1881 Census age 65 in Thornton
Thomas Galloway 30.1.1825
Thomas Galloway 26.9.1829
Robert Williams Balfour Galloway 31.7.1822
Isobell Galloway 16.12.1814 
Mary Georgina Balfour Galloway 22.9.1818 died 28.9.1820
Mary Georgina Galloway 31.8.1827 died 14.4.1835
Isobel Galloway 29.7.1813 died 6.3.1814
Catherine Galloway 9.6.1811
                                    
                                                       
1841 census, Thornton, Markinch      
         
Thomas GALLOWAY  57 Ag. Labourer b Fife                            
Isabella GALLOWAY 57 b Fife                            
Cathrine GALLOWAY 25 b Fife                            
Janet GALLOWAY 20 b Fife                            
Thomas GALLOWAY 11 b Fife 
Norrie