RG, if the OP does that, the nasty parents can stick him with the bill. From what we've read so far, this seems likely to happen. Most PPs have said not to use his own credit card, and I agree.
I've made a lot of reservations at a lot of hotels, and, IIRC, when one arrives the standard question about paying is "Do you want this to stay on your card?" and the standard answer is "Yes." All mean mom has to do is say yes, and the OP is stuck with the whole thing.
Or, she can just fail to show up, in which case the OP is stuck paying a night's room rental. She can claim some kind of excuse, and promise to pay back, and tell him the check's in the mail...
OP, don't let that happen! Make no reservation with your own card, and if you already have, cancel it!
Here! (RooRoo hands him a can of EH Spine Stiffener & PolishTM.)