The only other possibility that I am seeing at present on the Scottish censuses is this one in 1881:
Thomas Scott 16, lodger, clerk's apprentice, b. LiverpoolLiza M Gardiner 53, mangle keeper, b. Dundee
William Gardiner 29, calender worker, b. Dundee
Lindsey Gardiner 17, winder, b. Dundee
Address: 26 Dudhope St, Dundee Angus
I think this Thomas might be the same one as this one in 1871:
Elizabeth Scott 61, b. Ireland
Thomas Scott 24, power loom tenter, b. Greenock
Elizabeth Scott 20, saleswoman, b. Greenock
Thomas Scott 5, b. Liverpool
John McLaren 37, boarder, Student Of Urte (?spl) b. Glasgow
George Richardson 13, boarder, millworker, b. Manchester
Address: 58 Cresent Lane, Dundee
Thomas above is showing on the index as son to Elizabeth head. At age 61 unlikely so he is either g/son or son to Thomas or Elizabeth in the household. Would be worthwhile looking at the original to see how his relationship in the household has actually been written down.
I think this is the main family in 1851 back at Greenock:
James Scott 40, weaver, b. Ireland
Elizabeth Scott 38, b. Ireland
Mary Jane Scott 15, cotton mill girl, b. Domdel, Forfarshire
James Scott 13, rope work boy, b. Domdel, Forfarshire
Robert Scott 11, b. Domdel, Forfarshire
Stewart Scott 8, b. Greenock
Thomas E Scott 5, b. Greenock
William D Scott 3, b. Greenock
Elizabeth Scott 1, b. Greenock
William Young 36, lodger, b. Ireland
May Young 12, lodger, b. Greenock
Jane Young 10, lodger, b. Greenock
Archibald McKendrick 36, lodger, b. Ireland
Address: 52 Roxburgh Street, Greenock West
I cannot easily see the Thomas b. 1866 in Liverpool in the later censuses. There is only one Thomas showing b. England in his age range and he shows up to 1901 with mother.
Struggling to see anything else now Melonsmum.....
Regards.
Monica