Other Name and X others

When in FaceTime, if I choose a name to Face Time, generally a family member, the call dialog comes up with " Some Other Name and N others"

Where the Some Other Name is just that, and N others, could be 2, 3 ,etc. It does not appear as if these are part of a group I created, and the only person that answers is the one I originally selected.

What is causing this and how can I avoid it?