I'm still trying to search for Isabella's death - so far not found anything (and I've used Smith as well) - she could have died in a number of counties
However, the only James Brown (nephew to Robert on 1891 and 1901), born at the correct time in Coldingham was born 28th August 1865 at Hollydown, Coldingham. He was illegitimate. Mother was margaret Brown, agricultural labourer. No father's name given. The informant was what looks like Robert Brown, grandfather. Very poor writing, mind!
Have had a look at James as well, it could also be Adam Brown.
There are 2 Margarets in 1851 at Coldingham, age 9 daughter of Robert & Mary, she married in 1863 to a Thomas Fortune, the other age 13 father James, no connection. I have no Adam that would match nor any of the other siblings, could be another line
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Scottish Borders - Wait Binnie Aitchison Whitelaw Sligo Fairgrieve Fairburn Robinson Plenderlieth Robson Broadwith Park Dickie Kerr Wilson Lockie Oliver Brown Scott. Ross & Cromarty, Forsyth Bain. Kincardine, Forsyth Lownie. Staffordshire - Smith Steele Hallmark Colclough Dunn Booth Frost. Shropshire - Tennant. Sheffield - Savage England Corn Trippett. Lincolnshire - Savage Smalley Allitt Booth Addison Kirton. Huntingdonshire - Corn Connington Randall Baxter Booth .
I've found the family of an Adam and Agnes Brown, on the 1861 in Coldingham ( 732 ED 1 page , Holleydown Farm. There is a daughter, Margaret, aged 30.
No sign of a Robert or Isabella though (are they a different family?). So if James was Margaret's son, who was the James (nephew's) mother and where was he born?