Can 18 grams of porkroast feed a family of 4?

No, 18 grams of pork roast is not enough to feed a family of four. Typically, a serving size of meat is around 3-4 ounces (approximately 85-113 grams) per person. Therefore, for four people, you would need at least 12-16 ounces (about 340-450 grams) of pork roast to provide a satisfying meal.