Thanks all for the advice. I had some understanding of how the clan system worked, but I guess it didn't really dawn on me until it was explained here. Thank you!

It is going to take some digging if I'm going to come up with anything. I've made some progress with my paternal grandmother's family. Talk about confusion with naming. They're from Norway. It's enough to make my head explode. I have managed to get that back to the mid 16th century. My maternal grandparents both have roots in Germany and I've been able to trace that line just as far back.

Unfortunately, my paternal grandfather has passed, and there's pretty much no-one left in the family who has any information.

We can't locate what documentation gramps had, but we do know that he had a genealogy going linking us to Edward Doten, who arrived on the Mayflower. That puts both sides of my family here since the late 16th/early 17th century.

I have had the thought of just sticking with the Marine Corps Tartan and moving on. That might just be the best thing to do at this point (I'm not giving up, though).

Just out of curiosity, I've seen a plethora of Harbisons listed in County Stirling. From what little I've read of it so far, this seems to have been a critical piece of territory. As it seems the clans were more or less territorial in nature, I'd assume one was predominant there. I'm going to do some more research, but until I've either settled or exhausted trying to flesh out the tree a bit, does anyone happen to know what Clan or Clans that was?