Hey there, JorgeCule,
Thanks so much for using Apple Support Communities.
This is definitely unanticipated but we're happy to help figure out what might be going on.
To start, we want to recommend checking out this article: If you can't find your family's shared content - Apple Support That is a really great resource that can help resolve this type of issue. You can also share it with the affected family member so that they can try those steps on their devices.
It's also always a really great idea to make sure that your device and theirs are both running the latest versions of iOS/iPadOS and macOS. Updating can ensure that the latest bug fixes and resolutions are installed so that issues like this don't crop up. For iOS/iPadOS you can follow these steps: Update your iPhone or iPad - Apple Support. And for macOS, you can start here: Update macOS on Mac - Apple Support
We hope that this information is helpful.
Have a great day!