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I was going to ask the Irish Taxi Mensa lads that question .How can your younger twin be your older brother ?but after the Great egg Covid Conundrum I thought I would just tell you the answer .
I've twin sisters. I've always been led to believe that the twin who comes out first is actually the younger of the two. Something to do with the eldest one being further inside the womb. So big dommo may infact be small dommo.