This is pretty rare. Almost all test of twins that are in doubt are identical. Don't have a source right now but I remember because we wondered if we should ta

This is pretty rare. Almost all test of twins that are in doubt are identical. Don't have a source right now but I remember because we wondered if we should take a test as well. In retrospect (now 40+ years old and still looking very similar) it's hard to understand why we every doubted.