Please HELP, when a dealer plays one person and they bust, is the dealer allowed to change his card or does he have to keep that card to play the next person, as a relative changed his card every time he could, and I thought he could only change it after the first round until he has used that card and how many rounds is allowed, is it something determined before the game, as we are planing another night of cards, but need to know the rule for all.