At the Search Result Page, the information of Capacity, and Recommendation of number of passengers, and number of luggage are displayed based on each the Rental Car types and Car Classes.
Please be sure to count 1.5 seats for a child due to the space of a child seat.
Also, please consider the luggage space.
All your luggage may not be put in the car if your group fills all the seats of the car.
Even if the offered car is too small for you, any alternative car can NOT be offered.