Icloud storage for familiy
Using family icloud, can others see your data sharing icloud storage space?
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Not unless you intentionally share it using How to share albums in Photos on your iPhone, iPad, and Mac - Apple Support
or
Share folders with iCloud Drive - Apple Support
for example.
See the following from Share an iCloud storage plan with your family - Apple Support
When you share a storage plan, your photos and documents stay private and everyone keeps using their own accounts with iCloud—just like when you have your own storage plan. You simply share the space available in the iCloud storage plan with your family members, so you only have one plan to manage.