A:AnswerI do not think the 2 will work together. I have a Google "system" throughout the house and fire stick for my TV. Google Home will not control the firestick but Alexa will control the fire stick and Google will control it's version called Comcast. They are competitors after all. They do about the same things. You basically have to decide on which one you want to go with and stay with it.
A:AnswerI can answer some of your questions, yes you can have three of them all playing the same music at the same time. You can tell Google home to "play the music everywhere" and it will play the song throughout all the speakers. Google home well only listen when you say "OK Google" once you say that it will start listening and follow your commands. If you don't say the "OK Google" command first it won't do anything or say anything
A:AnswerFirst you need to download the google home app and make sure that your call settings are right. Once that is complete, then ask the mini or home to call someone in your phone book..it should work if you gave it access to contacts with the Home app. Also, make sure that all firmware and updates are updated!
A:AnswerUnderside of the Mini is a reset button. Hold it down until it responds, "you're able to completely reset..." From there, download the Google Home app on your phone. Look for devices, and pair your Mini. The only way to pair a Mini is through the Home app.
A:AnswerNo this is a great option for that. There have been many instances where I have lost my phone or something and used my google assistant to call. Works every time.
A:AnswerYes, it can. You only need the your note3 to do the initial setup then after that the google mini is always connected to the WiFi (as long as it remains in the home). You can stream from Pandora, Google Music, You Tube, etc. Your patient then can simply say, "OK Google, play <song> using <provider>. Hope this helps.
A:Answeryes, you can have a google home mini and an Amazon Alexa dot in the same house. I have my google mini in the kitchen and my Alexa in my bedroom