First things first: Your getResources call should be uncached. You do this like so (notice the exclamation):
Next, your screenshot does not show any of your parameters, so I can't see if they are done correctly... parent should actually be parents (plural), in case you are checking for multiples.
[[!getResources? &parents=`7`]]
Now, some things you should know about getResources... You will only get an array if you have results. You will only get results if they are published and not hidden (by default). This means that you must have published Articles in the Container. Your screenshot doesn't actually tell me if you have some.
Finally, when you make the changes, make sure you "Clear Cache". This is in the menu.