Two men with children on their shoulders.
Women carrying infants on their backs
Men and women are different genders.  Children does not imply that they are infants.  Shoulders and backs are not the same body part.
exists x1 x2 x3.(a_topic(x1) & on(x1,x3) & n_shoulder(x3) & of(x3,x1) & n_thing(x1) & with(x1,x2) & n_child(x2) & n_man(x1) & card_eq_2(x1))
exists e1 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_carry(e1) & on(x3,x4) & n_back(x4) & of(x4,x1) & n_thing(x1) & n_infant(x3) & (x1 = x2) & n_woman(x1))