Last two trips were with grandparents (2 different sets). For both I booked 2 rooms (request connecting-it's so nice) and I was the only one who was asked for id at check-in. Of course, I paid for both rooms on my card. Actually, on both trips it was easier for me to pay for everything on my card that was shared (hotel sit-down meals). At the end of the trip we added up the receipts and they gave me a check for their part.