At first I thought it was no biggie then, but my views changed when a lady cautioned me that it was definitely a no-no. While certain customs may frown upon it, others endorse it, perhaps with the reason that it would strengthen the family tree (I just don't see how). So, it came as a surprise to me when I read that a former model, Christy Turlington's younger sister is married to the younger brother of her husband, literally, her brother-inlaw.
Would you endorse such a relationship? Just curious!