The 1881 census shows parents George & Elizabeth Watt, siblings Marjory (3) Gergorgina (2)(their spelling) and Andrew (2 mths) living in Greenock Middle, Renfrew. George was a carter.

The same people together in 1891, but in Edinburgh St Cuthberts. George is a labourer, Georgina's forename is normalised. Marjory is a message girl.

There's several George Watt s in the 1901, but none look completely likely.

There's a Georgina Watt Blair, widow of Peter Blair in the WW1 pension records on Anc. He was Tank Corps. CWGC gives him as 307229, 14 Btn Tank Corps, 40y, d 9 Aug 1918 France. Husband of Georgina Watt Blair, Edinburgh. He's enlisted 1915 in the Royal Engineers.