A man in a gray shirt is bobbing for apples.
A grandpa is bobbing for apples with his grandchildren.
Not every men are grandpa and nothing says he's with granchildren.
exists e1 s1 x1 x2 x3.(for(e1,x3) & n_apple(x3) & Actor(e1,x1) & v_bob(e1) & in(x1,x2) & n_shirt(x2) & a_gray(s1) & Theme(s1,x2) & n_man(x1))
exists e1 x1 x2 x3.(for(e1,x2) & with(x2,x3) & n_grandchild(x3) & of(x3,x1) & n_male(x1) & n_apple(x2) & Actor(e1,x1) & v_bob(e1) & n_grandpa(x1))