In the past, I have made reservations with the family and used those coupons. But because of last minute changes, I either couldn't go, or had to arrive a day or two later. In those instances, I just made sure that both my wife's and my names were on the reservation. She brought the coupon and gave it to the hotel at check-in. In those few times, we have never had any issues or problems.

I suspect that as long as the last names are the same, there probably won't be any issues with using them. But that is only a guess based off the few times my family and I have done that.