Under Agnes McEwan's name could it read
Small Farmer 
There is this
1861 census entry for a mother and son named Agnes & Thomas
Balgair, Balfron, Stirlingshire
Agnes McEwen Head Unmarried 1824
Farmer of 9 acres Balfron, Stirlingshire
Elisabeth McEwen Sister Unmarried 1826 Balfron, Stirlingshire
Alexander McEwen Son 1849 Balfron, Stirlingshire
Thomas McEwen Son 1854 Balfron, Stirlingshireand 1851
Balgair, Balfron, Wester Stirlingshire
Thomas McEwan1786 Farmer (of 9 acres employing 2 labourers) Balfron
Ann McEwan Wife 1781 Farmer's wife Killearn, Stirlingshire
Agnes McEwan Daughter
Unmarried 1824
Farmer's daur Balfron
Elizabeth McEwan Daughter Unmarried 1826 Farmer's daur Balfron
Alexander McEwan Grand child 1848 Balfron
EDITED to
add1871c Balfron
Agnes Mcewin 46 Head
Elizabeth Mcewin 44 Sister
Thomas Mcewin 17 Son BalfronIs this Thomas with his wife Janet & family on 1881 census? Children Elizabeth & Agnes possibly named after his mother & Aunt
Thomas McEwen 28 Head Balfron occ Ag Lab.
Janet McEwen 29 Wife
Annie McEwen 9 Daughter
Elizabeth McEwen 6 Daughter
Agnes McEwen 4 Daughter
Robert McEwen 2 Son