A man and young boy posing in the backyard.
A dad and son are posing for their portraits.
The man and boy may not be dad and son and they may not be posing for portraits, it could be a different type of picture
exists e1 s1 s2 x1 x2 x3 x4.(n_backyard(x4) & a_topic(s1) & in(e1,x4) & Actor(e1,x3) & v_pose(e1) & (s1 = x3) & n_boy(x2) & a_young(s2) & Theme(s2,x2) & n_man(x1) & subset_of(x2,s1) & subset_of(x1,s1))
exists e1 x1 x2 x3 x4.(for(e1,x4) & n_portrait(x4) & of(x4,x2) & n_thing(x2) & Actor(e1,x1) & v_pose(e1) & n_son(x3) & n_dad(x2) & subset_of(x3,x1) & subset_of(x2,x1))