Hi Jo, I suppose you have your Smiths in the 1881 Census?  Here they are ( I think ) just in case.
Dwelling: Main Street, Old Kilpatrick.
SMITH  Hugh, 47, Head, Gen. Lab. born Ireland
SMITH  Elizabeth, 39, Wife, born Ireland
SMITH  Hannah, 19, Daur, Mill Worker, born Ireland
SMITH  Mary, 16, Daur, Mill Worker, born Duntocher
SMITH  Hugh, 15, Son, Mill Worker, born Duntocher
SMITH  John, 12, Son, Scholar, born Duntocher
SMITH  Elizabeth, 4, Daur, born Duntocher