Storage for Family
Not clear to me what happens for family Premium plan with Apple One. Can I just divide up the storage and everyone still has privacy?
iPad (5th gen) Wi-Fi
You can't divide it up. All family sharing members can use as much of the storage as is available. Regarding privacy, 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.