Thanks for that info and choosing the Apple Support Communities. If I understand correctly, you are unable to sync a calendar on your iPhone to your wife's iPhone. The best way to do this is to share a calendar using iCloud, and here is how to do that:
This thread has been closed by the system or the community team.
You may vote for any posts you find helpful, or search the Community for additional answers.
Syncing calendar iPhone 7 to family iPhone 6
Welcome to Apple Support Community
A forum where Apple customers help each other with their products. Get started with your Apple Account.