An app on iPhone 5 keeps asking for Apple ID?

Okay so I have an Apple ID that doesn't use a credit card (because I don't have one) so my dad downloads things that are paid if I want to get something. After getting it, it asked for his password every time I wanted to use it. It stopped after awhile, but after I updated it and used it a few more times, it's asking for his password again. I've tried rebooting and syncing but nothing is working yet.

You can't do anything that and if you want to download something you have to put password down no matter what every time. Its a safetly feature and you can't delete that option.

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