One child is reading to another.
A child is reading.
child is reading to another implies that   child is reading.
exists e1 x1 x2.(to(e1,x2) & n_thing(x2) & Actor(e1,x1) & v_read(e1) & n_child(x1) & card_eq_1(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_read(e1) & n_thing(x2) & n_child(x1))