People playing a game at the midway.
The kids are playing on the Wii at someone's house.
While the Wii is a game, it's not a common midway game, and someone's house cannot be at the midway.
exists e1 x1 x2 x3 x4.(n_midway(x4) & a_topic(x1) & at(e1,x4) & Theme(e1,x3) & Actor(e1,x2) & v_play(e1) & n_game(x3) & (x1 = x2) & n_people(x1))
exists e1 x1 x2 x3 x4.(ne_geo_wii(x2) & n_kid(x1) & at(e1,x4) & n_house(x4) & of(x4,x3) & n_person(x3) & on(e1,x2) & Actor(e1,x1) & v_play(e1))