two young boys making silly faces.
The brothers are making each other laugh with the silly faces they are making.
The boys would not necessarily be making each other laugh.
exists e1 s1 s2 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_make(e1) & n_face(x2) & a_silly(s2) & Theme(s2,x2) & n_boy(x1) & a_young(s1) & Theme(s1,x1) & card_eq_2(x1))
exists e1 x1 x2 x3 x5 x6.(n_thing(x5) & n_silly(x6) & n_laugh(x5) & n_brother(x1) & Theme(e1,x3) & Actor(e1,x1) & v_make(e1) & n_thing(x3) & all x4.((-(x4 = x5) & n_laugh(x4)) -> exists e2 e3 x7.(Theme(e3,x4) & Actor(e3,x2) & v_make(e3) & with(x4,x6) & Theme(e2,x5) & Actor(e2,x7) & v_face(e2) & (x6 = x7))) & (x1 = x2))