Hey, jussifromberlin.
I see that you're wanting to start Family Sharing group with your scattered family. You're not planning to share everything, however, and I'm glad to help.
Share App Store, iTunes Store, and Apple Books purchases with Family Sharing -- Since iCloud storage is a purchase, you won't be able to share it. Here's the footnote at the bottom of this article.
*Not all content and content types are available in all countries or regions. To share purchased content, all family members must use the same Apple ID country or region. Music, movies, TV shows, and books can be downloaded on up to 10 devices per account, five of which can be computers. Apps can be downloaded to any devices the family member owns or controls."
There are also other ways to share the information you'd like:
Let me know of other things you'd like to share if it's not in the list above.
Take care.