A standard Ditto call will do. For example, if the container document had id #10 you would use the following call:
[[Ditto?parents=`23`&tpl=`myTemplate`&display=`all`]]
Now, the chunk myTemplate would have the following in it:
Now, you will see a horizontal rule delimited list of all of the child documents content.
To make it dynamic, you would want to write a quick snippet that returned the preceding Ditto call (substituting the correct parent using $modx->documentObject[’parent’] ) if it was in the right folder.