Share reminder lists on iPhone
In the Reminders app , use iCloud to share reminder lists and keep your reminders up to date on other devices.
Share a list using iCloud
You can share a list with friends and family who also have an iCloud account. Those who accept the invitation can add and delete reminders, and mark reminders as completed.
While viewing a list, tap Edit, then tap Sharing.
Tap Add person, then enter an email address.
Tap Add, then tap Done.
Family members that use Family Sharing can also share a list. See Set up a family reminder.
Keep your reminders up to date on other devices
Go to Settings > [your name] > iCloud, then turn on Reminders.
Some other types of accounts, such as Exchange, also support Reminders. You can change how far back past reminders are synced in Settings > Reminders.
Tip: With OS X 10.10 or later, you can hand off reminders you’re editing between your Mac and iPhone.