Two men, one in blue and one in brown, are sitting on a boat.
A father and son go fishing
The first sentence says that the first men are sitting on a boat, doesn't say whether they are fishing.
exists e1 x1 x2 x3 x4 x5 x6 x7.(on(e1,x7) & n_boat(x7) & Actor(e1,x1) & v_sit(e1) & rel(x1,x2) & subset_of(x5,x2) & in(x5,x6) & n_brown(x6) & n_thing(x5) & card_eq_1(x5) & subset_of(x3,x2) & in(x3,x4) & n_blue(x4) & n_thing(x3) & card_eq_1(x3) & n_man(x1) & card_eq_2(x1))
exists e1 x1 x2 x3 x4.(Theme(e1,x4) & Actor(e1,x1) & v_go(e1) & n_fishing(x4) & n_son(x3) & n_father(x2) & subset_of(x3,x1) & subset_of(x2,x1))