Four people waiting for their train.
A family of four wait patiently for the train.
Four people do not have to be a family. Just because they are waiting does not mean they are doing so patiently.
exists e1 x1 x2 x3.(a_topic(x1) & for(e1,x3) & n_train(x3) & of(x3,x1) & n_thing(x1) & Actor(e1,x2) & v_wait(e1) & (x1 = x2) & n_people(x1) & card_eq_4(x1))
exists s1 x1 x2 x3 x4.(n_train(x4) & for(s1,x4) & Theme(s1,x2) & Pivot(s1,x1) & a_patiently(s1) & of(x2,x3) & n_wait(x3) & card_eq_4(x3) & n_family(x2) & n_thing(x1))