A baby and a young boy playing.
A little boy plays with his baby brother.
Just because the little boy plays with a baby doesn't make him his brother.
exists s1 s2 x1 x2 x3.(a_topic(s1) & subset_of(x2,s1) & n_playing(x2) & of(x2,x3) & n_boy(x3) & a_young(s2) & Theme(s2,x2) & subset_of(x1,s1) & n_baby(x1))
exists e1 s1 x1 x2 x3.(with(e1,x2) & n_brother(x2) & of(x2,x3) & n_baby(x3) & of(x2,x1) & n_male(x1) & Actor(e1,x1) & v_play(e1) & n_boy(x1) & a_little(s1) & Theme(s1,x1))