A large group of people are sitting on a lawn watching something.
A family is taking pictures of the scenery.
Not all large groups of people are family. Watching something does not mean taking pictures of the scenery.
exists e1 e2 s1 x1 x2 x3 x4.(for(e1,e2) & Theme(e2,x4) & Actor(e2,x1) & v_watch(e2) & n_thing(x4) & on(e1,x3) & n_lawn(x3) & Actor(e1,x1) & v_sit(e1) & of(x1,x2) & n_people(x2) & n_group(x1) & a_large(s1) & Theme(s1,x1))
exists e1 x1 x2 x3.(n_scenery(x3) & Theme(e1,x2) & Actor(e1,x1) & v_take(e1) & of(x2,x3) & n_picture(x2) & n_family(x1))