My mom and I are taking my DS to WDW in January and our 180 day mark for ADRs is coming up. My dad has expressed interest in going with us, but most likely won't make up his mind until a month or two before (and probably a 75% chance he WILL NOT go). How should I handle ADRs? Do I make reservations for 3 and then if he decides to come try to get him added? Or go ahead and make reservations for 4 and then cancel the 4th person if I need to?