They weren't both toddlers at the same time. Adam Clayton III is 20 years older than Adam Clayton IV, and the situation is further complicated by the fact that they have different mothers. I think the younger one was named Adam Clayton (like his father, grandfather, and half brother), but started out using his mother's surname. When he grew up and went into the family business of politics, he took the family name with the next available number. (I don't know if he did this before or after the birth of his nephew, also Adam Clayton IV.)
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Date: 2010-09-15 02:24 pm (UTC)