I have an iPhone 6S. All the rest of my family is using my Apple ID account on their own iPhone. The problem is the phone calls from them is showing on my call log. It is really annoy when sometimes I see the notification on my screen about some missed calls from my family member's friends. I finally fixed the trouble.
How to fix? Just turn off the Handoff function: Setting > General > Handoff & Suggested Apps > Toggle Handoff to Off.