Stewarts of Craigiehall and Newhalls

[stewey]

Hi family tradition says we're descended from the Stewarts of Craigiehall and Newhalls, but a cranky ancestor circa 1700 disinherited his three elder sons, David, John & Archibald (Stewart), due apparently to religious differences, and destroyed evidence of their connection with him.
The boys and their descendants went to Ireland, possibly, USA maybe, had sugar plantations in the West Indies, and had Northumberland as an eventual base by the mid 1800s.
There are connections with Turnbull families from Dundee, and Middletons, from Durham, too in the mid 1800s. From then on it gets easier.

I'd appreciate hearing from anyone to whom this may sound familiar!

[stewey]

P.S.

another quandry we have is my ggggfather was David Turnbull Stewart. According to the 1861 English census he was born in Scotland circa 1826. We can't locate him. However, his mother, according to their tombstone in Jesmond, Northumberland, was named Isabella Stewart Turnbull. (1801-1862ish).
According to the Newcastle Courant newspaper, in her obituary, she was the wife of David Turnbull.
So we can't figure out why his mother has a different surname from him, and his and her names are reversed-TS & ST.
He always claimed to be the eldest in the line of Stewarts for many generations, but we can also find no record of his marriage, under that name, in UK.