I accidentally bought something on Amazon?

Well I just got an iPhone 6, and the Touch ID button works as a password for Amazon, and I accidentally ordered a Dualshock 4, or the PS4 controller. Only one problem, it's my fathers Amazon account and I'm not sure he would accept me buying something with out his permission. I only found out today because it shipped here today. So what do I do? I think my dad will get pissed! Do you think I should tell him and keep it? Or tell him and return it? I really want a PS4 buying it with my own money but he won't let me because my mom thinks it will be time consuming, which is not true because I would probably spend half my time that I spend on my phone on the PS4 which is about 1.5 hours and my mom has never been bothered by me using my phone 3 hours a day. So what do you think? Anyways thanks you guys!

You don't "accidently" order stuff, it confirms and you ok the purchase.

Maybe you're getting a surprise! You can't accidentally order things from Amazon.