A man and a young child.
A man with his son.
Not every young child with a man is his son.
exists s1 s2 x1 x2.(a_topic(s1) & subset_of(x2,s1) & n_child(x2) & a_young(s2) & Theme(s2,x2) & subset_of(x1,s1) & n_man(x1))
exists x1 x2.(a_topic(x1) & with(x1,x2) & n_son(x2) & of(x2,x1) & n_male(x1) & n_man(x1))