A older gentleman working on a road bicycle while talking to a younger gentleman.
A father and son work on a bicycle.
Just because one man is older than another, it does not mean that the older man is the younger one's father.
exists e1 e2 s1 s2 x1 x2 x3 x4 x5.(a_topic(x1) & while(e1,e2) & to(e2,x5) & n_gentleman(x5) & r_more(s2) & a_younger(s2) & Theme(s2,x5) & Actor(e2,x2) & v_talk(e2) & on(e1,x3) & n_bicycle(x3) & of(x3,x4) & n_road(x4) & Actor(e1,x2) & v_work(e1) & (x1 = x2) & n_gentleman(x1) & r_more(s1) & a_older(s1) & Theme(s1,x1))
exists e1 x1 x2 x3 x4.(on(e1,x4) & n_bicycle(x4) & Actor(e1,x1) & v_work(e1) & n_son(x3) & n_father(x2) & subset_of(x3,x1) & subset_of(x2,x1))