Is it possible to enable Family Sharing and not include sharing of photos?

Hello there, diegocdlg.

It seems like you've come from the article that explains how shared photos work with Family Sharing:

Family Sharing - Apple Support

As indicated here, not all photos are shared, you would need to share particular photos to the "Family" shared album:

The whole family can contribute to the family photo album.

Now collecting and sharing family memories is easier and more fun. When Family Sharing is turned on, a shared album is set up automatically in the Photos app on all family members’ devices. Then everyone can add photos, videos, and comments to the album and be notified when something new is added. You can add or view photos and videos from iPhoto on your Mac, and from Photos on your iPhone, iPad, or iPod touch with iOS 7 or later.

If you wish to use other features of Family Sharing and not this one, you just wouldn't share any photos to that location.

Thanks for participating in Apple Support Communities.

Cheers,

Pedro