Looking for a family brain system

I look for a good note taking and brain library for my whole family. That helps my family and me in daily life

Nothing seems to work perfect yet...

I found: Paperless -> bad GUI and in practice not visual enough for me. Obsidian -> sync git to complicated for family and much git sync problems. Appflowy -> good GUI and in practice very good. But expensive and not a good stable release only 2 members free to use and selfhosted is very hard and not enough clarity of functions available Joplin -> bad GUI and not so visual in markdown and in practice not easy enough for me.

Requirements

1. Whole family must be able to use it.
2. Must have ai integration to search through files or prompt for answer.
3. Syncing must work easy and saved in a local and external db.
4. Pictures and videos must be able to load from the document
5. Gui fast, easy simple
6. Cross platform: Mac osx, android , iOS, windows and Linux.

Wish: Collaboration in same file live sync like google docs

I seen appflowy has this and obsidian too with a payed addon works very good but also had limits.

Obsidian is to much local storage and files and the app works worse then native appflowy and is not a database like approach its a bunch of files in. Directory what does not have to be bad but in my use cases it is.

Notebook LLM seems something I need but it's to much in the cloud and can't selfhost it right?