Hi Dave,
Got 7 results for a Thomas McCall marrying an Elizabeth in Scotland between 1855 and 1932, this is earliest we can get marriages online in Scotland Peoples website, SP. So if Thomas and Elizabeth married after 1932, we would need someone to visit GRO at one of the main centres Edinburgh or Glasgow.
1858 Thomas McCall Elizabeth McArthur – Edinburgh 685/01 0163
1873 Thomas McCall Elizabeth Gilchrist - Kirkcudbright 860/00 0003
1876 Thomas McCall Elizabeth Park - Glasgow 644/07 0370
1880 Thomas McCall Elizabeth Hockey - Edinburgh 685/03 0036
1893 Thomas McCall Elizabeth Murray - Kirkcudbright 870/00 0001
1894 Thomas McCall Elizabeth Baillie - Falkirk 479/00 0127
1898 Thomas McCall Elizabeth McCall - Edinburgh 685/01 0363
If you can verify one of them as yours, that would give us their parents, so a great start. The numbers are reference numbers on Marriage Certificates on SP, you can register at that site, and 30 credits cost Ł6. It would cost 6 credits to download a marriage certificate (MC)
However when and/or where were your parents born and/or married, this may assist too.
Tom