This has probably been asked, but our 4 yr old son is not tall enough for Space Mountain. Myself, my wife and DD are tall enough. We booked a FP for him for the ride because it was easiest when we booked. If we booked him another ride using that FP, would one of us be able to ride with him, since he couldn't go on alone ? It just seems like we're wasting a FP by booking one knowing he can't use. Any suggestions would be appreciated.