An adult female and three children are in a canoe with one of the kids rowing the boat.
Four people are in a boat.
An adult female and three children are four people.  A canoe can also be a boat.
exists p1 x1 x2 x3 x4 x7 x9.(n_boat(x9) & n_kid(x7) & exists e1 x5 x6 x8.(in(x1,x5) & with(x5,x6) & of(x6,x7) & Theme(e1,x9) & Actor(e1,x8) & v_row(e1) & (x7 = x8) & n_thing(x6) & card_eq_1(x6) & n_canoe(x5)) & n_child(x4) & card_eq_3(x4) & n_female(x3) & subset_of(x4,x1) & subset_of(x3,x1) & of(x1,x2) & n_adult(x2))
exists p1 x1.(exists x2.(in(x1,x2) & n_boat(x2)) & n_people(x1) & card_eq_4(x1))