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Can I say that my niece is accompanied by an adult?

I am flying with south west with my family and my nephew and niece want to ho with us but the plane is full and there is a plane from united leaving my nephew is 17 hell be 18 in 3 months and niece is 8 can I say that my nephew is 18 and then if they ask tell them it was a mistake so I don't get charged 150 dollars. Also does south west also charge?

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