Hello Amy,
In my MI book I found an inscription for George and others. It reads
"David Hogg, Mason , 15.3.1881 age 74. Widow Margaret balfour 15.4.1866 age 53. Daughter Elizabeth 6.1857 age 8. Daughter Jane 19.7.1866 age 15. Son George lost at sea 10.1861 age 31, his mother-in-law Elizabeth Robertson 22.3.1858 age 82, daughter Ann survives. George M Boath died Montrose 22.9.1886 age 42, his son Robert 3.10.1885 age 3yrs 8mths"
Now, on adjacent stones there are the following.
" 1883 by David Hogg and margaret Balfour In memory of children Agnes died in infancy, David 26.7.1867 age 27 "
" By David Hogg, mason and Margaret Balfour In memory of sons Alex 22.9.18349 age 15 James 12.7.1834 age 9mths "