Calling a child resource from a chunk?

I have a feeling that this should be simple but I am completely lost...

I have made a page that shows four resources in a square. I have used Ditto for this. Each resource is given a layout in a chunk. So far, so good.

Now, I know these resources in the square will only ever have one child resource each. And I want all four of them (the parents) to show a link to that child resource. But I don’t know how. I hope it’s clear what I am trying to do. Can someone point me in the right direction?

well, let me see, you want to link the child to his parent?

if yes:

<a href="[~[*parent*]~]">Go Back</a>

Microdual,
José Moreira
Dep. Desenvolvimento

And I want all four of them (the parents) to show a link to that child resource

Not child have a link back to parent.