Ok, that makes sense. It looks like Ursula is used only for U5. So would you argue that only U5 are "European"?
I tested with the Genographic Project and they only told me U. I can narrow down a little bit, just based on where I'm from... but it's not specific enough. For eg, I'm pretty sure I am not U6, since it's most common in North Africa and I am from the Caucasus. Of course, I don't have enough information to know my actual subclade. I'd like to do further testing when I have the money.
We do have a common ancestor, and she lived in a certain region, whether some of us are considered "European" or not. I remember reading that U members outside of Europe are probably the result of reverse migration - meaning that at least some of your ancestors were in Europe at some point, no? (Although I also see a source claiming U6 descended from an R female. Why is it U6 then?)
I'd refer you to the links I'm using, but I'm not allowed until I've made 10 posts at this forum.