A lady sleeps while seated in a yellow chair.
My Grandfather is watching television on his favorite chair.
A grandfather is not a lady.  If a person sleeps, then they cannot be watching television.
exists e1 s1 x1 x2 x3.(in(e1,x3) & n_chair(x3) & a_yellow(s1) & Theme(s1,x3) & while(e1,x2) & n_seat(x2) & Actor(e1,x1) & v_sleep(e1) & n_lady(x1))
exists e1 s1 x1 x2 x3.(on(e1,x3) & n_chair(x3) & a_favorite(s1) & Theme(s1,x3) & of(x3,x1) & n_male(x1) & Theme(e1,x1) & Actor(e1,x2) & v_watch(e1) & n_television(x1) & n_grandfather(x2) & of(x2,x1) & n_person(x1))