I was doing a follow-up visit on an older couple who had visited our church. During the visit, he asked me if I knew who the first twins in the Bible were. Jacob and Esau immediately came to mind but I thought he was telling a joke like, "How long did Cain hate his brother? As long as he was 'Abel'." But he was serious and believes that Cain and Abel were the first twins. I turned to Genesis four and looked and I couldn't refute the suggestion. It is the first I had heard of someone believing this. It certainly makes no difference doctrinally, but I was wondering if anyone else had considered this possibility.