During the early years that the Durness Parish Register was kept, the minister did not record the mother's name when registering a christening. This can cause some doubt in positively identifying certain people. However, I think the following have a high probability of being correct:
16 Jul 1772 Rory Sutherland in Clasneach had a son, Donald
9 Jun 1771 Hector Morison, alias MacDhonil, in Cerruac, had a daughter, Catherine
(Cerruac was the place from where she got married)
Hector Morison in Durin christened a son, George, 27 April 1768
I could find no marriage for a Rory Sutherland around that time. He had an older son, George, christened in Clasneach 12 April 1769. The register was started in 1764 and it is possible he was married before then.
I couldn't find a marriage for Hector Morison either and, again, it's possible he married prior to 1764
That's about it.
Ian