Family setup with kids

Hello,

I try to figure out how to setup Kodi so children and adult content is separate.
We have four main folders on the NAS :
- adults series
- adults movies
- kid series
- kid movies

We would like to have the adults see both children and adult movies and series, while children see only kid's series or movies. I tried a lot but it seems too difficult for me
Any help would be appreciated.
Ideally, I would like to have adults to enter a pincode to authenticate.  Is this possible ?

Thanks,

George