When you grill lamb shoulder, the recipe might not always indicate how many chops you need to feed a whole family. The shoulder is a meatier cut from the loin, so one or two chops would definitely feed an individual.  Four lamb shoulder chops should be fine for small families, but eight chops are better for larger families. If you get your cut from the ribs, these are smaller and require more to feed a family (perhaps a whole rack of lamb).