Is a parent consent essential for two US citizens minors to re-enter the US?

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Question by mauricio a: Is a parent consent required for two US citizens minors to re-enter the US?
My mom just traveled out of the nation (USA) with my two siblings, one particular six and the other 9. My father authorized their exit at the airport. My two sibling are US citizens, will they want a letter of consent from my father to re-enter the USA even even though they are US citizens. Btw, they traveled to El Salvador. My mom has already

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