It's awkward to talk about. Do you worry because you feel a secret preference for one twin over the other? Many parents do, whether they admit it or not. It's normal. It happens to most parents at some point. In fact one study claimed that it is instinctive, that parents can't help but show favoritism. In families with singletons, birth order lends a structure to the favoritism. Maybe Dad brags about his high-achieving eldest child, while Mom fawns over the baby of the family. But when there are twins or multiples, where there is an expectation of equality, favoritism feels uglier, more hurtful. What about you? Do you have a favorite twin? Vote anonymously in this week's poll, and then leave a comment if you'd like to share your thoughts.