This looks like them in 1881 although Elizabeths age is a little out and POB different;
1881 Census
St Mary, Dundee, Angus
James SIM, 27, (1854), Head, Joiner, born Dundee, Forfarshire
Elizabeth Sim, 25, (1856), Wife, born Dundee
William Sim, 8mths, Son, born Dundee