Share a reminder list on Mac
If you set up iCloud on your Mac, you can share reminder lists with other iCloud users. Everyone who shares the list can create and edit reminders from any computer or device set up with iCloud. Notifications aren’t shared; you can set a reminder to remind you at a time or place, but it won’t remind anyone else.
If you use Family Sharing, all members of your family automatically share a reminder list called Family. See Set up Family Sharing.
Share a list
In the Reminders app
on your Mac, place the pointer over the name of a reminder list that’s listed below iCloud in the sidebar, then click the Share List button 
.If the sidebar isn’t showing, choose View > Show Sidebar. If iCloud doesn’t appear in the sidebar, then your Mac isn’t yet set up with iCloud.
Enter one or more email addresses, then press Return.
Click Done.
All invitees receive an email invitation and a notification. They must accept one of them in order to view and edit the shared list.
Stop sharing a list
In the Reminders app
on your Mac, click the Share List button next to the shared list in the sidebar.If the sidebar isn’t showing, choose View > Show Sidebar.
Delete all participants by selecting their names and pressing Delete.
Change participants
In the Reminders app
on your Mac, click the Share List button next to the shared list in the sidebar.If the sidebar isn’t showing, choose View > Show Sidebar.
Do any of the following:
Add a participant: Enter the person’s email address, then press Return.
Remove a participant: Select the person, then press Delete.
Resend invitations
In the Reminders app
on your Mac, click the Share List button next to the shared list in the sidebar.If the sidebar isn’t showing, choose View > Show Sidebar.
Click the triangle next to a person’s name, then choose Invite Again.
Reply to a list invitation
If you accept a shared reminder list invitation, you can view and edit the list in Reminders. You can access shared reminder lists using Reminders on an iOS device, iCloud Reminders at www.icloud.com, and Microsoft Outlook on a Windows computer.
In the Reminders app
on your Mac, select the shared list in the sidebar.If the sidebar isn’t showing, choose View > Show Sidebar.
Shared lists have a Share List button
next to them.Click Accept or Decline.