What is the difference between Family Sharing and Apple One?

You are welcome. Set up Family Sharing using the article I posted above and then subscribe to the Apple One Premier plan if you want 2 TB of iCloud storage.

For Family Sharing, you can also set up Ask to Buy.

Family Sharing -  Ask to Buy.      

Family Sharing -  Ask to Buy - Get Help.     

Family Sharing lets you share all purchases and some other things. Apple One is a subscription service that contains certain apps/programs such as Apple TV and Apple News. You can use Family Sharing to share Apple One.

Family Sharing articles

Family Sharing.         

Family Sharing - Set up.       

Apple One article

Apple One - Get

You are welcome.