Sharing calendar with wife’s phone

Hello rbuttrum,

We'd be happy to provide you with some information. If you need help creating, sharing, or managing access to a shared calendar, you can learn how to do that here: Share iCloud calendars on iPhone - Apple Support

These steps may help:

Create an iCloud calendar

1. Tap Calendars at the bottom of the screen.

2. Tap Add Calendar.

3. Type a name for the new calendar, then tap Done.

Share an iCloud calendar

You can choose to share a calendar with one or more people in iCloud. Those you invite receive an invitation to join the calendar.

1. Tap Calendars at the bottom of the screen.

2. Tap  next to the iCloud calendar you want to share.

3. Tap Add Person, then enter a name or email address, or tap  to browse your contacts.

Note: Your contacts must have an email address to share an iCloud calendar. See Add and use contact information on iPhone.

4. Tap Add

Thanks.