A nice example of naming convention:
Note the step daughter to Thomas in the 1861: Agnes Willock, 7 ( b.c. 1854), Dreghorn and, in 1871:
West End, Dalry
Thomas Fisher, 36, miner, b. Ireland
Mary, 36, b. Dreghorn
Agnes Willock, step daughter, 18, b. Do
Robert, 11
John, 9
Alexander, 8
Thomas, 6,
Mary, 1
All others b. Dalry
Gadget