Just for the record so Hilton doesn't play the coconut shell game again: The 2 standard room types
are bookable on 120K points for 3 adults in 1 room. When I booked a month ago I had to manually add my kid (the third person in the room) onto the "additional guests" section to push the 120k points booking through. Now I see that is not even necessary anymore. This is a record in case they do some shifty stuff in the future (also per expedia/hotels.com these rooms fit 3 adults) - see pic by TravelerDave.