I recently booked a trip and we're staying at the MGM. Me and my wife are flying out of Cleveland together, and my sister is meeting us out there flying from Nashville. We're all staying in the same room. Since we're flying out of different cities, I couldn't book the trip for all of us on the website, so my sister just got her own flight and I took care of the flight/hotel package on my end. She gets in at 3pm and we don't in until 10pm. I didn't think it would be a big deal for her to check into the room for me, but since the room only has mine and my wife's name on it (b/c of our flight/hotel package), they won't let her check in for me. It seems like they want to make me add her to the room/pay extra for her. Has anyone else had this issue before? Will I be able to get her into our room when I check in, or do you need to show proof that you're staying there to get to your room? Sorry for the long winded post. Thank you for your input!