Sharing keychain
Can I share my keychain with other members of my Apple family?
MacBook Pro 15″, macOS 10.15
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No keychain folder from user library and its password can't be shared when family sharing account is activated see the article https://support.apple.com/en-us/HT204976
This way your family can share purchases, an Apple Music family plan, iCloud storage, photos, and more without sharing personal information like email, text messages, or passwords .