premise: Two young adult passengers of a vehicle are sleeping.
hypothesis: Two family members are asleep in the back seat of a vehicle.
explanation_1: You can be in a car with people other than family members.
explanation_2: Not all young adult passengers necessarily be family members.The fact that passengers of a vehicle are sleeping doesn't necessarily mean that they are sleeping in the back seat of the vehicle.
explanation_3: Two passengers in a vehicle doesn't necessarily mean they are family members. Sleeping in a vehicle doesn't imply that they are in the back seat of the vehicle
premise_logic: exists e1 s1 x1 x2 x3.(Actor(e1,x1) & v_sleep(e1) & of(x1,x3) & n_vehicle(x3) & n_passenger(x1) & of(x1,x2) & n_adult(x2) & a_young(s1) & Theme(s1,x1) & card_eq_2(x1))
hypothesis_logic: exists s1 s2 x1 x2 x3 x4.(n_seat(x3) & a_back(s2) & Theme(s2,x3) & in(s1,x3) & of(x3,x4) & n_vehicle(x4) & Theme(s1,x1) & a_asleep(s1) & n_member(x1) & of(x1,x2) & n_family(x2) & card_eq_2(x1))