It isn't your checking account. You aren't on it. That is the bottom line addressed in the rules. You have the upper hand when doing so since if you lose, you could play dumb if your parents asked if you made the deposit. They then can have the charge dropped by the bank since they didn't make it. If you win, you confess to your parents what you did, take your lumps w/ them, then collect the winnings. Of course they will say you had approval when you win 6k or whatever.
Actually on the flip side the book has the same upper hand. You lose, so be it. You win but too bad so sad it isn't your checking account. Read the rules.