That's easy. Take care of your responsibilities at home without being asked. Take care of them before doing what you want to do. After your responsibilities are completed go to your parents and ask them if there is anything else you can do for them before you go do your "thang". That'll really knock them over.
You have to ask your parents if you could go do community service like go to a soup kitchen or whenever you are walking around with or without your parents and give a homeless person some money. Good luck getting your item and feeling good at the same time! ;)