Alexander Marr - died Cupar Muir 27th December, 1878 and his wife Agnes Dewar - died South Street St Andrews 18th January, 1875.
Robert Marr - died ca 1850 and his wife Janet Brown also died ca 1850 at Cameron, Fife
Hi isk  Alexander Marr & Agnes Dewar can't find any stone for them
I see from the 1851 Census Logie they had the following Children 
MARR    Alexander         Head         M         M         36         Shepherd          Fife - Cameron           
MARR         Agnes         Wife         M         F         42         -          Fife - Cameron           
MARR         William         Son         U         M         14         Scholar          Fife - Kilconquhar           
MARR         Janet         Dau         U         F         12         Scholar          Fife - Cameron           
MARR         Alexander         Son         -         M         7         At Home          Fife - St. Andrews           
MARR         George         Son         -         M         4         At Home          Fife - Logie      
                
do you know who the children married?
Robert Marr & Janet Brown Can't find any stone, they had a number of
children according to family search
Thomas 1808, Margaret 1810, David 1812,James 1814,Alexander 1816
Elizabeth 1819, Charles 1822, George 1825
the 1841 census Cameron 
MARR         Robert         M         60         Agricultural Labourer          Fife 
MARR         Janet         F         55                   Fife 
MARR         George         M         15         Joiner Apprentice          Fife
 do you know if Margaret 1814 married Thomas Morgan headstone inscription
Newburn Cemetery
66 Thomas Morgan Farmer Monturpie died at Largo 30.5.1866 age 65?
wife Margaret Marr died at Markinch 30.12.1862 age 72
Monturpie Farm is now a caravan site and restaurant lovely food
Charles 1822 married Isabella Chalmers 1852? 1881 census Kennoway
do you know the children married?
Charles MARR    M    59     M    Cameron, Fife, Scotland
    Rel:    Head
    Occ:    Grocer Master
Isabella MARR    M    54     F    Kettle, Fife, Scotland
    Rel:    Wife
    Occ:    Grocers Wife
Jessie B. MARR    U    23     F    Kennoway, Fife, Scotland
    Rel:    Daug
    Occ:    Grocers Daug
Isabella C.B. MARR    U    21     F    Kennoway, Fife, Scotland
    Rel:    Daug
    Occ:    Grocers Daur
Mary Ann MARR    U    18     F    Kennoway, Fife, Scotland
    Rel:    Daug
    Occ:    Grocers Daur
Jane P. MARR    U    15     F    Kennoway, Fife, Scotland
    Rel:    Daug
    Occ:    Grocers Daur
Catherine MARR        12     F    Kennoway, Fife, Scotland
James 1814 married Alison  Buist 1839? Cameron 1881 Census Cameron
do you know who the children married?
James MARR    M    65     M    Cameron, Fife, Scotland
    Rel:    Head
    Occ:    Gen Lab
Alison MARR    M    64     F    Newburn, Fife, Scotland
    Rel:    Wife
George MARR    U    32     M    Cameron, Fife, Scotland
    Rel:    Son
    Occ:    Master Joiner
David MARR    U    24     M    Cameron, Fife, Scotland
    Rel:    Son
    Occ:    Gardiner (Out Of Employ)
Alison MARR        5     F    Edinburgh, Scotland
Norrie