Everything works surprisingly well.
I changed the variable from Object Reference to Class Reference as I only need the parent name.
I have Actor BP_Box, I have his child BP_Child.
Converting from String to Class looks like this;
In case of more children, probably more Branches will suffice.
In the near future I will try to make the whole system more neat and make it available for free at a market, as you can’t find anything like that anywhere.