How are we related if our grandfathers are brothers?

Question:

How are we related if our grandfathers are brothers?

I started working at a nursery recently and one of the other nursery nurses had the same unusual surname as me. We got talking about what a coincidence it was as it is such a rare name - and eventually we discovered we are related as my grandfather is her grandfather's brother! But, I am confused.... HOW are we related? Are we cousins once/twice/something removed? What are our fathers to one another? Is there a site where it tells you how to work this stuff out?

Best Answer - Chosen by Asker: Very cool that she's related! You would be second cousins, and your fathers would be cousins.

It's all explained in the site below. =)