Hierarchy order - flip objects order

Hi everyone,

I stumbled upon something I thought would be easy to do today.
Here is my problem:

I have a cloner, with 20objects inside, and what I’d like would be to “reverse” or “flip” the order of the hierarchy.
So let say the children are ordered from 1 to 20, I want them to be from 20 to 1 instead.

But I can’t find a easy way to do it instead of manually moving them in my object manager.

Does anyone has a solution for this?

Thanks!
Thomas