Wilhelmina also had John Smith McNoe (born 1871). They are living with granny, Janet, in 1871, but there's no sign of Janet (1873). There's a daughter, Agnes, born c. 1820 in Gibraltar. Janet (c. 1790 in Burntisland) is a soldier's widow, so might explain why there's little baptisms in Scotland for their children.
hume24
Full entry:
Address: Annan Rd, Dumfries
Janet McNoe, f, head, 80, soldier's widow, Burntisland, Fifeshire
Agnes ", f, dau., 51, ag labourer, Gibraltar
Wilhelmina ", f, g-dau., 19, general serv, St Mary's, Dumfriesshire
Thomas ", m, g-son, 11, scholar, St Mary's, Dumfriesshire (son of Agnes)
John S Stundell, m, g-son, 2 months, -, St Mary's, Dumfriesshire