Would you like to have a twin?
Would you like to have a twin? Just for a day? Why not? Why would you? What about triplets?
I guess my only 'againsts' would be that you might not get much individuality as kids, especially if your parents dress you in the same clothes and you have the same circles of friends. All the twins I've known have been known as 'the twins' not by their individual names, I know that's terrible but it's true!!