This Guy's Brother Married My Cousin!

This weekend, Mr. M. and I went to a family reunion, and in talking to a distant relative, we found that he and his wife had, unbeknownst to us, attended the same church as us for a while. They both looked familiar, and our church is pretty big, so we weren't too surprised, but we wonder if there are any other people at church that we are distantly related to.