Thanks for the information.
Having spent vacations in Scotland for the past 30 years, I can assure you that all Scottish people are not light skinned and they certainly aren't all short. There are too many people well over 6 feet in my Scottish grandmother's ancestry and I see too many tall folks (men and women!) in the grocery stores there to have me buy into that generalization. People vary in coloring and height, hair color and eye color in Scotland, just as they do in the USA. You will find all tones of skin and hair.
I have the 1851 and 1861 censuses that include Robert with his parents, and the 1871 census that doesn't since he had come to the USA.
1851 Census living atXXXXX, Pollokshaws
James Neil 36 M (b abt 1815) b Galston, Ayrshire, wine merchant
Hellen[sic] Neil 27 F (b abt 1824) b Glasgow, Lanarkshire
Robert Neil 5 M (b abt 1846) b Pollokshaws
George Neil 3 M (b abt 1848) b Pollokshaws
James Neil 2 M (b abt 1849) b Pollokshaws
Susan McCormick 19 F (servant) b England
1861Census living at Pollokshaws, Eastwood, Renfrewshire
James Neil 45 M (b abt 1816) b Glaston, Ayrshire, commission agent
Helen Neil 37 F (b abt 1824) b Glasgow, Lanarkshire
Robert Neil 15 M (b abt 1846) b Pollokshaws
James Neil 12 M (b abt 1849) b Pollokshaws
John Neil 9 M (b abt 1852) b Pollokshaws
Elizabeth Neil 7 F (b abt 1854) b Pollokshaws
Helen G. Neil 4 F (b abt 1857) b Pollokshaws
Margaret Neil 1 F (b abt 1860) b Pollokshaws
Janet Rankin 16 F (servant) b England
Evidently, the son George who was 3 in 1861 (b abt 1848) died soon after the census. In the 1871 census Robert, James and John are gone, and there is another son George age 9 (born about 1862).
1871 Census, Eastwood, Eastwood, Renfrewshire
18-20 Greenbank Ser Ker St
James Neil 54 M (b abt 1817) Galston Parish, Ayrshire, commission agent
Helen Neil 46 F (b abt 1825) Glasgow, Lanarkshire
Elizabeth 17 F (b abt 1854) Pollokshaws, Renfrewshire, power-loom weaver
Helen 14 F (b abt 1857) Pollokshaws, Renfrewshire
Harriet 11 F (b abt 1860) Pollokshaws, Renfrewshire
George Neil 9 M (b abt 1862) Pollokshaws, Renfrewshire