Share reminders and collaborate on iPhone
In the Reminders app , use iCloud to share reminder lists and collaborate with anyone who is signed in to iCloud.
Share a list using iCloud
You can share a list and collaborate with people who also have an iCloud account. People who accept the invitation can add and edit reminders, and mark reminders as completed.
While viewing a list, tap , then tap Add People.
Enter one or more email addresses, then tap Add.