A search of the Civil Marriage registers for Marykirk & for St. Cyrus shows the link between the Don & Nicol families which you are seeking. David Don who married Jane Gordon in Marykirk in 1869 was the brother of Isabella Don who married George Nicol in St. Cyrus in 1861. Parents were Hercules Don & Isabella m.s. Duthie. Hope this helps. Eileen.