Two men, one on a bike and one that is walking.
father and son together
Just because the two men are near each other doesn't mean they're father and son.
exists e1 x1 x2 x3 x4 x5 x6.(a_topic(x1) & rel(x1,x2) & subset_of(x5,x2) & Actor(e1,x6) & v_walk(e1) & (x5 = x6) & n_thing(x5) & card_eq_1(x5) & subset_of(x3,x2) & on(x3,x4) & n_bike(x4) & n_thing(x3) & card_eq_1(x3) & n_man(x1) & card_eq_2(x1))
exists s1 x1 x2.(a_topic(s1) & subset_of(x2,s1) & r_together(x2) & n_son(x2) & subset_of(x1,s1) & n_father(x1))