To figure relationship you have to have a common ancestor. So You Cousin parent parent paternal grand father paternal grand father paternal great grandmother paternal great grand mother (the aunt) maternal great great grand mother parents of aunt maternal great great great grandparent This means there 5 generations back to your common ancestor and 4 generations back to the common ancestor for your cousin. the relationships go first generation - siblings second - 1st cousins third - 2nd cousins fourth - 3rd cousins Since you are of unequal generations and the difference is 1 then you are third cousins once removed. This assumes that she descends from the union of her paternal great-grandfather and your paternal great grandmother's maternal aunt. Julia [email protected]