iPad and iPhone not connected
My husband has an iPad and iPhone which don’t share information. He and family have tried to resolve by signing out and in, but no joy. Has he 2 Apple IDs?
iPad, iPadOS 18
He and his family should be able to tell you if he has two accounts because he would be using different information to sign into each one. They would need unique email addresses as the account identifier.
Make sure iCloud is set up on both devices. This document basically tells you how to sign into iCloud --> Set up iCloud on all your devices --> https://support.apple.com/guide/icloud/set-up-icloud-on-your-devices-mmfc0f1e2a/icloud
This article provides more configuration information --> Change your iCloud feature settings [iOS and Mac] - https://support.apple.com/HT207689
Of course both devices have to have some way to connect to the Internet via either WiFi or cellular.
I could go on providing links to support articles but it would be helpful to have more specifics such as what kind of information they should be sharing and if indeed they are using different accounts.