Matt's entire family was going to spend the week at the lake house for vacation.  Matt's family included his mom, dad, his older brother and his wife and their 4 kids.  His Uncle Joe and his wife were also coming and would bring their 3 kids.  The house only sleeps 4 people.  Everyone else would sleep 2 to a tent outside.  How many tents would they need?
Please reason step by step, and put your final answer within \boxed{}.
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