If you stay at the Swan or Dolphin, you will have to show your room card. It won't be RFID compatible, so scanning will be useless. Because your entitlement to EMHs is proven by your room card, make sure that at check-in you get a card for every member of your family. If you think: "Oh, we just need a card for mom and dad. The kids will always be with us so they won't need their own cards", you risk trouble later if you want to use EMH. It is possible that you could convince the CM that the kids are all with you, but you could run into a rule follower.