Oh that's a good idea about Mary

1841 ?
1849 married Comrie
1851 age 32 Mary McGregor res Dalginross, Comrie
1861 age 47 Mary McGregor res Turnpike Road, Comrie
1871 ?
1881 ?
1891 age 81 Mary McGregor Dalginross, Comrie, Perthshire
Robert McGregor was born Balquhidder
In 1851 he's an agricultural labourer
In 1861 he's a shepherd
In 1891 it's just Mary and Janet so maybe Mary's husband Robert was dead by then ?
Also likely Mary died between this 1891 census and Janet's death in 1895 ?