OK, so I am on a family plan with me, my sister, and my parents and we all have iPhones. just recently all calls going to my number are being recieved by both my phone and my sisters phone, I am running iOS 8 and I think my sister it too. Please help, thanks!
You are sharing the same AppleID. You each should have your own AppleID and set up Apple iCloud Family Sharing so you can still share most apps without paying for each one again. This is a new feature in iOS since iOS 8. It is designed if you have an iPhone and an iPad, you can get your calls through the iPad too.
You can also go into Settings - FaceTime and turn off Calls from iPhone
That would certainly cause issues, and unwanted calls too, Idefoe. You may have a service feature called Continuity enabled on your devices. Let's take a look and see if this is indeed the case.
If you go to Settings>FaceTime> Is the option for iPhone Cellular Calls enabled?
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