According to the grant of arms by Lyon to his grandson James George Morison, this James, sometime of Dunbrae in the Parish of Logie and County of Fife, had four sons:

1. Eldest son, the late Major George Morison, sold that Estate and died unmarried.
2. Henry second son died unmarried,
3. James, third son of of James Morison, who married Mary Shewan Brown, daughter of John Brown merchant in Glasgow,
4. John Morison fourth and youngest son died unmarried.
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Additionally there was the daughter Margaret who married William Brown, second son of Joh the merchant of Glasgow and which William was brother to the above Mary Shewan Brown.

I have yet to find if there were any more daughters.
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