Hi all

In past when i search for hotels from Marriot websites i never get room availability. I search for 2 adults 2 child in one room (2 year old and 4 year old). I want to ideally try book direct is that possible maybe book with 2 adults 1 child so i get room then email hotel to add extra child in? Other sites i get rooms for Marriot etc but just not with direct. Is there usually policy for room occupancy?