Shortcode show only parent or child pages in hierarchy

Hi, I need to specify which posts get loaded based on their hierarchy position.

Say I have a post named ‘Main’ and a post named ‘Sub’ in the same Pod. I’ve enabled hierarchy so I can put ‘Sub’ under ‘Main’. Now on two separate pages I would like to show only the ‘Main’ on one page and on another page only the ‘Sub’ by adding something in the shortcode (if possible). These will be separate shortcodes as well.

Is this possible through the shortcode?

Thanks in advance!