Refer from Booking No. 853464809 your family guest have total 2 Adults & 3 Children. We are think that your guest booked 1 room not enough for family because this room have room size 40 sq.m. and can add 1 extra bed only, so we are think that your guest ought to booked 2 rooms.
And room description
Can you please confirm that the guest can stay 2 adults and 3 children age 9,6 and 2 years old. The guest has asked for an extra bed and has been informed by you that there is a charge of 850THB per night. According to the room description it states that Bedroom 1 has got 1 double bed and bedroom 2 has 2 single beds. The 2 year old can sleep in the same bed as the parents. Therefor the guest does not need an extra bed.