How to display all children on parent node for custom content type?

I have a custom content type, let’s call it ‘parent’. I have another custom content type, let’s call it ‘child’.

I created a template file where I can display the ‘parent’ content type fields any way I want: node--parent.tpl.php. By using code such as…

<?php   print $content['field_city'][0]['#markup']; ?> 

I can move fields around and customize the markup, which is great. But how would I also display the parent’s children on the same page?

(I don’t use Views. I create a content type template file instead because gives me more flexibility for arranging the HTML).

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How to display all children on parent node for custom content type?

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