The email reminders I get look like:

Subject: You are using Google Location Sharing to share your real-time location.

Hi Jeff,

To protect your privacy, we would like to remind you that you are sharing your real-time location using Google Location Sharing with [wife] and [close friend and housemate].

If you didn't enable this or want to stop sharing your location at any time, please go to your Google Location Sharing settings.

Thanks,

Google Location Sharing Team