Great update!
I actually started worrying about that last night. What will I do if I move out spares for 10 generations and there's nothing but Dreamweavers in town? I might need to re-think this.
As mentioned by a previous poster, I doubt this would happen with story progression.
In the case that it did occur, though it's kind of awkward to think about, you can marry second-cousins and beyond.. I don't know if that's against the rules.. but you gotta do what you gotta do, I guess!