Some of the Dalgarnos are on FindAGrave.
In the burial ground around this stone are interred the remains of James Dalgarno, weaver, sometimes residing at Nether Kinmundy who died at Slains on the 5th of Jan'y 1845 aged 88 years. Also John Dalgarno, weaver, who died at Millbrack in Jan 1831 aged 44 years. And George Dalgarno, son of the said James Dalgarno for 23 years Merchant in Slains who died at Aberdeen on the 23rd June 1847 aged 53 years. He maintained a high charactor for integrity and moral worth and died deeply regretted by a large circle of friends. Also in memory of Jane Taylor, spouse of the said James Dalgarno, who died in June 1830 aged 68 years. [Old Deer kirkyard]
Noting that James D and Jean Taylor lived at Nether Kinmundy, and that John D, widower of Margaret Sangster, also lived at Nether Kinmundy, might lead one to think that James D, son of John D and Margaret S, was the one who married Jean Taylor, and therefore that the one who married Margaret Ramsay was the son of William D and Margaret Sangster?