Young boy wearing waders standing on a dock fishing, other people are in the background.
A boy fishes on a dock as his dad looks on.
Nothing implies the young boy knows the people in the background, so we don't know any of the people are the boy's dad.
exists e1 e2 p1 s1 x1 x2 x3 x4 x5 x6 x7 x8.(n_background(x8) & n_people(x7) & in(x1,x8) & on(e2,x4) & rel(x4,x6) & -(x6 = x7) & n_people(x6) & n_fishing(x4) & of(x4,x5) & n_dock(x5) & Actor(e2,x3) & v_stand(e2) & (x1 = x3) & n_wader(x1) & Actor(e1,x1) & v_wear(e1) & of(x1,x2) & n_boy(x2) & a_young(s1) & Theme(s1,x1))
exists e1 e2 x1 x2 x3 x4 x5.(on(e2,x5) & n_thing(x5) & Actor(e2,x1) & v_look(e2) & on(e1,x3) & as(x3,x4) & n_dad(x4) & of(x4,x1) & n_male(x1) & n_dock(x3) & Actor(e1,x2) & v_fish(e1) & (x1 = x2) & n_boy(x1))