According to the 1880 census, there is a Alexander SCORGIE living with James in Cambridge, MA that meets your birth date that is James' nephew, not brother.
Household Record 1880 United States Census
Name Relation Marital Status Gender Race Age Birthplace Occupation Father's BirthplaceMother's Birthplace
James C. SCORGIE Self M Male W 29 SCOT Bookeeper SCOT SCOT
Anna M. SCORGIE Wife M Female W 27 SWED Keeping House SWED SWED
Alex'Der. SCORGIE Nephew S Male W 15 SCOT At Home SCOT SCOT
Census Place Cambridge, Middlesex, Massachusetts
Family History Library Film 1254543
NA Film Number T9-0543
Page Number 196B
Since Scotland national registration started in 1855, you can get the images of those BMD events that happened in Scotland after 1855. The images are on the official Scotland website, ScotlandsPeople - http://www.scotlandspeople.gov.uk/
. You will pay UK£6 by credit card (about US$10-11) for 30 credits. Each search results table costs 1 credit to see. Each image downloaded costs 5 credits.
I would also strongly suggest that you send you query to the Aberdeenshire mail list. http://lists.rootsweb.ancestry.com/index/intl/SCT/ABERDEEN.h...
There are several very experienced researchers who will be glad to help you with your research.