Called Assignable Reminders, the feature lets you set reminders for other people, so long as they are in your Google Contacts or opted in to your Family Group.
You can create a reminder using your voice ("Hey Google") or text, and set it to be delivered to a phone or via a smart device at a certain time, or make it geo-location aware so it shows up when the person arrives at a particular place, like the home or office.
According to Google, Assignable Reminders can be set to repeat, and you'll be able to check a history of reminders you sent to other people and any that have been assigned to you.
For children under 13 to use assignable reminders, they must be granted access to the Assistant on Google Home by adults in the household, and all users can block someone from sending them Assignable Reminders.
Assignable Reminders will roll out over the next few weeks in the U.S., the U.K., and Australia. The feature will work on Google's smart speakers, Android devices, and iPhones and iPads with the Google Assistant app installed.
Google's Assistant app is a free download for iOS, available on the App Store. [Direct Link]