A man, a woman with a child in a stroller on a crowded street.
A family is walking down a crowded street.
A man,a woman and a child in a crowded street need not necessarily be a family. Just because people are on a crowded street doesn't mean that they are walking down the crowded street.
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 e1 s1 s2 x1 x2.(a_down(s2) & Manner(e1,s2) & Theme(e1,x2) & Actor(e1,x1) & v_walk(e1) & n_street(x2) & a_crowded(s1) & Theme(s1,x2) & n_family(x1))