I’ve been searching for a while via Ecosia, Google etc. and on Reddit but I’m struggling to find an answer.

My parents are moving together with my grandma to a new house with a little annex for my grandma. They’re planning to get Alexa’s so that my grandma can call through to the other side of the house if she falls over or needs help. I would love for them not to end up giving every conversation they ever have to Amazon’s servers… Is there any way to replicate this functionality in Home Assistant (i.e. call between satellites across the network)? If I can figure this out I’ll build a self-hosted setup for them.