The three boys who are wearing life jackets are looking into the water.
The boys are brothers
Just because three boys are wearing life jackets does not mean they are brothers.
exists e1 e2 x1 x2 x3 x4 x5.(n_water(x5) & n_boy(x1) & card_eq_3(x1) & into(e2,x5) & Actor(e2,x1) & v_look(e2) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & n_jacket(x3) & of(x3,x4) & n_life(x4) & (x1 = x2))
exists p1 x1.(n_boy(x1) & exists x2.((x1 = x2) & n_brother(x2)))