People gather by the edge of the water.
The family is flying to their vacation spot.
If people gather by the edge of the water they cannot be flying to their vacation spot.
exists e1 x1 x2 x3.(n_water(x3) & n_edge(x2) & by(e1,x2) & of(x2,x3) & Actor(e1,x1) & v_gather(e1) & n_people(x1))
exists e1 x1 x2 x3.(n_spot(x2) & of(x2,x3) & n_vacation(x3) & of(x2,x1) & n_thing(x1) & n_family(x1) & to(e1,x2) & Actor(e1,x1) & v_fly(e1))