Designate one person to make the online hotel reservation. List all occupants when making the reservation, including children and their ages. Children under the age of 18 may stay free of charge in a parent’s room. There is an additional charge of $20 per person, per night for more than two adults (age 18+) sharing a room. You should notify the hotel at check in if any of the guests in your room are under age 18 and exempt from the extra person charge.