Can my parents see what i bought with a prepaid debit card?

I want to buy sims 3 online with my prepaid debit card. My parents will kill me if i bought another though (i broke my other one, i dont want them to freak). They gave me the prepaid debit card for christmas, im just wondering, will they be able to see what i bought? Im not sure if they bought it with a credit card or cash, if thats something you should know.|||yup they can find out if they ask the bank for account balance sheet.