Group of people sitting at a restaurant.
A family sits at a restaurant.
A group of people can sit at a restaurant without being a family.
exists e1 s1 x1 x2 x3.(ne_org_group(s1) & a_topic(s1) & of(s1,x1) & at(e1,x3) & n_restaurant(x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_people(x1))
exists e1 x1 x2.(at(e1,x2) & n_restaurant(x2) & Actor(e1,x1) & v_sit(e1) & n_family(x1))