99.9999% of front desk people could care less if your dad is there or not. Make that 99.999999999999999999999999999999%.

Odds are you will be fine if he just adds your name to the reservation.

Shoot, I got checked into a Marriott the other night under a complete stranger's name. It was 1:00 AM so I was too tired and apparently he too. Lucky that stranger didn't show or it could have been a fiasco!