Re: John Blaikie 1756 - 1826 Aberdeen
I really don't if this helps but my paternal grandmother's family link back to the Blaikie family as follows:
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John BLAKIE of Devanha (Aberdeen)
brother of James BLAKIE & Sir Thomas BLAKIE
Had a daughter, Mary BLAKIE, and son, John Blakie (shipowner?)
Mary married Dr George Jaffray NICOL and had 4 children - Jane Ann, Georgina, Agnes & Alexander Jane.
Jane Ann NICOL married Lt Col Sir George King in 1868 and had 2 sons - Robert George and Patrick Nicol Blakie KING (born 1878) who was my great grandfather.
I hope this information is of use.
All the best