Hello RB-CCB,
Welcome to Apple Support Communities. We see you have some questions about a Family Share with iCloud+ plan. We'll include some information that should help answer those questions and resource links for your info as well.
We'll be posting information from this article:
Share iCloud+ with your family
"When you share an iCloud+ subscription, everyone in the family group uses their own account. That way your photos, documents, and other information stay private, even though you're sharing access to the service. You simply share the features and space available in iCloud+ with your family members, so you only have one plan to manage."
To share photos as you describe, setting up a Shared Album might work best:
Share iPhone photos with Shared Albums in iCloud
Here is our specific article on hiding your email address. It should be kept separate for each family member:
What is Hide My Email?
All the best.