Set up of 3 camera's

I purchased the 3 camera set from QVC. My intent is to have 2 set up outside my home and the other one set up inside my dad's home, who lives about 5miles away. My question is, 1. Do I have to scan all three devices separately when setting up and do the set up 3 times? 2. Will I be able to talk to my dad through the device? Thank you, Domill