Are all photos shared when you share iCloud??
Or how do you manage this ahead of sharing the drive in Family sharing?
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Sharing an iCloud Storage plan does not share photos or other data. See the following from Share iCloud+ with your family - Apple Support
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.
If you want to share photos with your family (whether or not you are sharing an iCloud storage plan) see infromation in How to use iCloud Shared Photo Library - Apple Support