Your Cassies are an interesting - and large - bunch.

And on this journey, I’ve found two links into my own family! There are a lot of them - and I’m not entirely convinced I’ve got them all yet, as the surviving parish records for King Edward for most of this period are incomplete.
James Cassie and
Elizabeth Killoh had 10 children that I’ve found so far, between 1799 and 1811. James also had two children with his first wife,
Isobel Pirie, who he married on 2 Feb 1794 in King Edward. Fortunately, all the children survived beyond 1855, so death records exist - and Elizabeth Killoh herself lived until 1863.
I can’t find any record for James Cassie’s birth or death - although there are a couple of trees on Ancestry which have him born in 1752 to
William Cassie and
Marjory Reid (this is one of the few baptisms that appear in the King Edward records). I’m not sure I’m buying this as our James, as that would have made him over 40 when he first married and nearly 60 when his youngest son was born - which isn’t beyond the bounds of possibility, but I wonder if there’s a generation missing. If there is, however, I can find no documentary evidence of it.
There is a James Cassie (presumably James Cassie senior) listed at Auchnagorth in the 1809/10 Aberdeenshire tax rolls - then there’s a gap in the 1819/20 rolls, where Auchnagorth appears against George Chalmers and John Black. By 1830/31, Auchnagorth is back with the Cassies, with James Cassie (presumably the James born 1796, who appears as head of the house in the following censuses). So James Cassie senior must have died between 1810 and 1820 - which would fit with him being around 60 in 1810, I suppose.
None of these Cassies appear to have been buried at King Edward - or at least, no monuments appear to survive - and there are practically no burials recorded in the parish records.
By way of summary - the children of James Cassie - the first two with Isobel Pirie, the remainder with Elizabeth Killoh:
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Margaret Cassie, b. 1794, King Edward; m.
William Mitchie, 1816, King Edward; d. 1862, Forglen, Banffshire; two children.
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James Cassie, b. 1796, King Edward; d. 1866, King Edward; unmarried.
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Ann Cassie, b. abt 1799, King Edward; d. 1880, King Edward; unmarried.
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John Cassie, b. abt 1801, King Edward; d. 1886, King Edward; unmarried.
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William Cassie ,b. abt 1802, King Edward; m.
Margaret Urquhart, 1828 King Edward; d. 1890, King Edward; six children.
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Andrew Cassie, b. abt 1803, King Edward; m.
Jane Andrew, 1827 King Edward; d. 1870, Old Machar; six children.
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May Cassie, b. abt 1803, King Edward; m.
James Kidd abt 1827 King Edward; d. 1887, King Edward; three children.
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George Cassie, b. abt 1804, King Edward; m.
Ann Andrew, 1827, King Edward; d. 1884, King Edward; nine children.
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Alexander Cassie, b. abt 1805, King Edward; m.
Mary Philip, 1830 King Edward; d. 1897, New Deer; eleven children.
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Robert Cassie, b. abt 1807, King Edward; d. 1869, King Edward; unmarried.
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Adam Cassie, b. abt 1809, King Edward; d. 1868, King Edward; unmarried.
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David Cassie b. abt. 1811, King Edward; m.
Mary Robertson, 1833, King Edward; d. 1888 King Edward; nine children.
There are two other Cassie families in King Edward around the same time - who I suspect are related - and possibly related to this James Cassie branch.
Peter Cassie and
Isabel Ross had a son,
John Cassie, in 1781, who married one
Jean/Jane Cassie (b. 1802), daughter of
William Cassie and
Elspet Greig - I would guess they were cousins, making William Cassie and Peter Cassie brothers - and also perhaps James Cassie senior - although I have no evidence of that…
John and Jean/Jane Cassie had four children in King Edward before settling in Orkney.
William Cassie and Elspet Greig’s son,
James Cassie, was a shoemaker, and he and his family are evident in the census records in King Edward. He married twice - first to
Martha Laird, with whom he had at least eight children; and second, to
Margaret Thom, with whom he had a further six children. James, Martha and Margaret are the only members of this extended family who appear to be buried in King Edward kirkyard.
William Cassie and Elspet Greig's son,
William Cassie, married
Ann Massie from Marnoch, Banffshire - I’ve only found two children for this couple. Their daughter,
Margaret Cassie died a spinster - she appears with her father, William, in the 1841 census in King Edward. There was another daughter born to William Cassie and Elspet Greig,
Isobel Cassie, but I can’t find any trace of her after her baptism in 1804, so perhaps she died in infancy.
And as a footnote - the primary link into my own family is via Mary Philip, wife of James Cassie and Elizabeth Killoh’s son Alexander. Mary Philip’s brother, Thomas Philip, married my 2nd cousin, 6x removed, Christian Lawrence.
Phew

Ruth