A man, a woman with a child in a stroller on a crowded street.
A young family is on a crowded street.
Not every man and woman with a child are a young family.
exists s1 x1 x2 x3 x4 x5.(a_topic(x1) & rel(x1,x2) & on(x2,x5) & n_street(x5) & a_crowded(s1) & Theme(s1,x5) & in(x2,x4) & n_stroller(x4) & with(x2,x3) & n_child(x3) & n_woman(x2) & n_man(x1))
exists p1 s1 x1.(exists s2 x2.(on(x1,x2) & n_street(x2) & a_crowded(s2) & Theme(s2,x2)) & n_family(x1) & a_young(s1) & Theme(s1,x1))