Family sharing
If I use family sharing and add people are they able to see my messages , phone calls , emails or my pictures ?
iPhone 7 Plus, iOS 13
No, and only pictures if you specifically make them available with a shared album.
What is Family Sharing? - Apple Support
Set up Family Sharing - Apple Support
How to download apps and content that your family members purchased - Apple Support
What types of content can I share with my family? - Apple Support
Photo sharing --> http://www.apple.com/icloud/family-sharing/