The two children watch the small yellow dog on the tree.
The children are brothers.
It is not necessary the children are brothers
exists e1 s1 s2 x1 x2 x3.(n_tree(x3) & n_dog(x2) & a_yellow(s2) & Theme(s2,x2) & a_small(s1) & Theme(s1,x2) & n_child(x1) & card_eq_2(x1) & Theme(e1,x2) & Actor(e1,x1) & v_watch(e1) & on(x2,x3))
exists p1 x1.(n_child(x1) & exists x2.((x1 = x2) & n_brother(x2)))