How to have a certain user inherit all file permissions from another user as if they were the owner

Question

I just switched to Fedora 27 and was wondering if what I want is possible.

I want a certain user to inherit all permissions from another user (Meaning: Being able to access files as if I were the owner)

I'd like a structure as follows:

root
├── desktop_user
│   ├── firefox
│   ├── chrome
│   └── games
│       ├── game_1
│       └── game_2
└── All other applications

Where I want the desktop_user to be able to access files from all sub-users in the tree. but firefox and chrome would not be able to act as desktop_user.

The same goes for desktop_user and root. I do not want to have access to root unless I enter a password. I am looking for a clean way to do this, preferably.

Answer 1

Allright, I think I have it figured out with the help of George Udosen.

I edited the sudoers rules using: visudo -f /etc/sudoers.d/overrides

desktop_user ALL=(%desktop_child) NOPASSWD: ALL

Where desktop_child is the group assigned to all children in the tree from desktop_user.

This allows desktop_user to sudo all it's children, but not vice versa.