iCloud storage - 200Gb = $2.99 sharable per month
2Tb = $9.99 sharable per month
https://www.apple.com/family-sharing/
Sharing purchases - https://support.apple.com/en-us/HT201085
Hide purchases - https://support.apple.com/en-us/HT201322
Apple One - https://www.apple.com/apple-one/?cid=svc-us-kwgo-brand
How do I share my Apple photo library with family?Use Shared Albums on your iPhone, iPad, and iPod touch
Go to the Albums tab and tap the Add button .
Tap New Shared Album.
Give the shared album a name, then tap Next.
Choose people to invite from your contacts, or type an email address or iMessage phone number.
Tap Create.
How to share albums in Photos on your iPhone, iPad, and Mac
https://support.apple.com/en-us/HT202786
Apple Introduces iCloud Shared Photo Library and New Family Sharing Setup Features
Apple Arcade - Play Across All Your Devices