..........degree of relationship............. @ This question occurred to me and I'm wondering if it sounds natural. What is the degree of relationship between my wife and my brother? 1. It’s second. 2. It’s the second. 3. It's the second degree. 4. They are related in the second degree. 5. They are second degree relatives. @@ I think #4 and #5 are fine. What do you think about #1 to #3? Thank you