If we leave the EU, a question.

I like being a EU citizen, I like what EU aims to be and the benefits membership gives us. It's not perfect but to me much more attractive than the alternative

There I said it.

So my question is;

What happens if Brexit actually happens and down the road Scotland leaves the UK and rejoins the EU.

I can't believe I'm even considering it but since my grandad was Scottish could I choose my nationality?