A man and his son looking at a mime.
Man and child observing street preformer.
A child is definitely the son of man and looking is a rephrasing of observing.
exists e1 s1 x1 x2 x3 x4.(a_topic(s1) & subset_of(x2,s1) & at(e1,x4) & n_mime(x4) & Actor(e1,x3) & v_look(e1) & (x2 = x3) & n_son(x2) & of(x2,x1) & n_male(x1) & subset_of(x1,s1) & n_man(x1))
exists e1 s1 s2 x1 x2 x3 x4.(n_preformer(x2) & of(x2,x4) & n_street(x4) & Actor(e1,x2) & v_observe(e1) & of(x2,x3) & n_child(x3) & n_man(x1) & subset_of(x2,s1) & subset_of(x1,s1) & a_.(s2) & Theme(s2,s1) & a_topic(s1))