The age of the players was given in the OP but not the set of rules they were playing under.
Fed rules covers this in 2-16-1e
"A foul is a batted ball that touches the ground after inadvertently being declared foul by an umpire."
If this were a FED game we would have a foul ball no matter which umpire called it or how loudly he called it!
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"When I umpire I may not always be right, but I am always final!"
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