An elderly woman sowing cloth outdoors.
A grandfather is feeding the ducks.
A grandfather is a man, not a woman.  The person is either sowing cloth or feeding ducks.
exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_sow(e1) & n_outdoors(x3) & of(x3,x4) & n_cloth(x4) & (x1 = x2) & n_woman(x1) & a_elderly(s1) & Theme(s1,x1))
exists e1 x1 x2.(n_duck(x2) & Theme(e1,x2) & Actor(e1,x1) & v_feed(e1) & n_grandfather(x1))