Hmmm. There are only three George Thomas McKays in the birhs index
- born 1904 in Glasgow Dennistoun
- born 1933 in Glasgow Possilpark
- born 1985 in Glasgow
and two deaths
- 2004 in Glenrothes, age 99, mother's surname Cormack
- 2007 in New Kilpatrick aged 73, mother's surname Campbell
and two marriages
- to Catherine Keith Campbell in Glasgow Blythswood in 1930
- to Elizabeth McInnes in Glasgow Milton in 1958
I wonder if the one born in 1904 is the one married in 1930 and father of the one born in 1933?
A copy of the 1958 marriage certificate would provide the answer to that question.