The older woman is talking to the child.
A father and son play ball
An older woman talking to a child is not a father and son playing ball.
exists e1 s1 x1 x2.(n_child(x2) & n_woman(x1) & r_more(s1) & a_older(s1) & Theme(s1,x1) & to(e1,x2) & Actor(e1,x1) & v_talk(e1))
exists e1 x1 x2 x3 x4.(Time(e1,x4) & n_ball(x4) & Actor(e1,x1) & v_play(e1) & n_son(x3) & n_father(x2) & subset_of(x3,x1) & subset_of(x2,x1))