post_parent should be the ID of the post parent, not the slug.
Apart from that, your code should work. If not, look for any posts_* filters or pre_get_posts actions that might influence your custom query
EDIT
Something else I have missed, $args is already an array, so you do not need to add it another array when calling it.
$the_query = new WP_Query( array( $args ) );
should be
$the_query = new WP_Query( $args );
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