Hello Alison,
I received a message to say that someone had posted a message on the Benholm thread.
I remember seeing the name Blue/Blues as I was doing my own research, my own family wandered around the Mearns, some emigrating, some heading for Arbroath or Montrose, the two nearest main towns. Some of my relatives headed for Dundee. I never came across any who went in the other direction, up north to Aberdeen. Dundee library have info re people in the Montrose / Arbroath area plus Dundee itself. It would be a main starting point.
If you have no luck there try the North East Family History Society in King Street in Aberdeen; I assume you can get info on line from them, I've just been there in person twice, the people there were very helpful.
Some of my family also headed for Fordoun, it's more inland, and although it's a blink and you are through it place now, there were more people living there in the 1800's. The nearest Churchyard is in Auchenblae, the old one and the new one. The old one is really old and I think the graves go into the 1800's, but there aren't that many, I think most people were buried with no gravestone, and I'd love to know where they were buried, because the size of Auchenblae church yard which surrounds the new Church (incorporating the ruins of St Palladius Chapel) doesn't seem to reflect the many people who lived in the Parish over the centuries.
Look up the Angus Family History Society too, on line.
Good luck with your search!