Display specific page (that is child) content on parent page

You were being too specific/not passing the correct parameters into your wp_query.
This should get you what you’re looking for:

<?php
$current_page_id = get_the_id();
$investor_content_query = new WP_Query( 'post_parent'=> $current_page_id ) );
if ( $investor_content_query->have_posts() ) {
    while ( $investor_content_query->have_posts() ) {
        $investor_content_query->the_post();
        the_content();
    }
}
wp_reset_postdata();
?>

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