Two young girls sitting on an all terrain vehicle.
Two sisters wait for their father to take them for a ride
Two girls are not always sisters. There is not mention of another individual when describing the girls and the vehicle.
exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & on(e1,x3) & n_vehicle(x3) & of(x3,x4) & n_terrain(x4) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_girl(x1) & a_young(s1) & Theme(s1,x1) & card_eq_2(x1))
exists e1 p1 x1 x2.(for(e1,x2) & n_father(x2) & of(x2,x1) & n_thing(x1) & Topic(e1,p1) & Actor(e1,x1) & v_wait(e1) & exists e2 x3.(for(e2,x3) & n_ride(x3) & Theme(e2,x2) & Actor(e2,x1) & v_take(e2)) & n_thing(x2) & n_sister(x1) & card_eq_2(x1))