IPhone keeps asking for Apple ID?

Okay, story time… A few years back my dad gave his phone to my mom. And I restarted the whole thing. Then after awhile it kept asking for my DADS Apple ID, even though he wasn't signed in anywhere.
Today my mom got a new iPhone and she restored it on iCloud. But now it keeps asking for my dads Apple ID password and he does not remember it at all. And again, he isn't signed in anywhere on the phone.

How can we get my moms iPhone to stop asking for an Apple ID that isn't hers?

Once activation lock is turned on, the only way to turn it off is with the password.

  • Why does my iPhone keep asking for my Apple ID password? I have a 5c and I'm on IOS8. I went on it today and it just randomly asked for my password. I entered it but nothing happened/downloaded. I was just wondering if it was a glitch or something.
  • My Iphone keeps asking me to verify payment on a free app? I downloaded the facebook app on my phone with no problem but when I try to download Twitter onto my phone it keeps saying "press continue to verify payment" and when I press continue nothing happens… its the free twitter app so I don't know why its even asking for something like this…
  • My iPhone keeps asking me for my apple I. D password? I changed my apple Id and password. Whenever I go to the App Store from my iPhone it asks for my new password to my new apple id which is good. But at random times when I'm texting or something, the old Id will pop up and asks me to type in my password. I don't know how to fix this but it's driving me crazy. :/
  • IPhone keeps asking for Apple ID password? I charged my iphone 4s with iOS 7 from dead battery, and when i turned it on and unlocked it, it came up with the pop up to enter the apple ID password for my iCloud account. No matter how many times i entered the password or pressed cancel, it would keep popping up a couple of seconds later. I tried restarting the phone, but now its popping up with the same thing asking for my Facetime account. It is annoying because i can't use my phone. Any solutions?