nyone in your home can interact with Google Home by saying the hotword, "Ok, Google".
When someone other than the person who set up a Google Home interacts
with the device and the device does not recognize their voice, their
communication history is stored in the activity history of the Google
Account used to set up the device, which can be accessed at myactivity.google.com.
If you allow guests to use your Google Home, be sure they understand
that those interactions will be stored by Google and that you can view and delete that information. When you have guests in your home, you can consider using the microphone mute button or putting the device away as well.
Others in your home can add their accounts to your Google Home using
Google Home’s multi-user functionality. If they do this and Google Home
recognizes their voice when they interact with Google Home, their
interactions will be stored in their own communication history at myactivity.google.com.
If you do not set up multi-user functionality on your device so that
your Google Home can recognize your voice, anyone in your home can ask
about information you have made available to Google Home. Additionally,
if Google Home’s multi-user functionality mistakes a recording of your
voice or someone else's voice as you, Google Home may convey your
information to that user. To prevent others from accessing private
information like reminders and calendar entries from your Google Home,
you can turn off Personal results in the Google Home app. This can be set device-by-device, so you can
give a Google Home in your bedroom different access to your information
than a Google Home in your kitchen.