Just learned about Family Base and wanted to start using it but I'm discouraged to find out in the FAQ that the "companion app" is not compatible with Android Marshmallow. I have Marshmallow on my phone, but kids' phones are older and do not have Marshmallow. Just what is the "companion app"? Is it what is installed on the kids' phones, or is that on the parent phone as well? Will I be able to get Family Base to work as long as my kids' phones don't have Marshmallow even if mine does? Or perhaps is it possible use Family Base from a web site but perhaps not from my phone?