Here are the facts:[p]6 Adults and 6 kids ages 7-13.[p]Two butts (bone in) each 8 lbs.[p]Serving with tortillas for tacos, also tamales, beans and salad.[p]One doesn't seem enough, two seems like over kill.[p]What do you think? Do you use a per person factor to determine the butt to guest ratio?[p]Thanks!