We need to add Matt's entire family together so 1+2+2+4+2+3 = <<1+2+2+4+2+3=14>>14
Only 4 people could sleep in the house so 14-4 = <<14-4=10>>10 people would sleep in a tent
Each tent sleeps 2 people and there were 10 people left so 10/2 = <<10/2=5>>5 tents were needed
#### 5