Profile: Jay

<div class="cred-group cred-group-parents">
  <div class="cred-field cred-field-_wpcf_belongs_page_id">//change "page" to your parent post slug
    <label class="cred-label">
      Choose Parent
    </label>
    <input type="hidden" id="parents_id" value="[get-parents]" /> This is only for test display: [get-parents]
      [cred_field field='_wpcf_belongs_page_id' value='']//change "page" to your Parent Post Slug
  </div>
</div>

jQuery('document').ready(function(){
   
var post_parents = jQuery('#parents_id').val();
   
var arr = post_parents.split(',');
     
  jQuery("[name=_wpcf_belongs_page_id] > option").each(function() { //change "page" to your parent post slug
       
    var option_val = jQuery(this).val();
       
     if( jQuery.inArray(option_val, arr) == -1 && option_val != -1 ){
       jQuery(this).remove();
     }
  });
     
});

function get_parents($atts) {
    global $current_user;
    get_currentuserinfo();
    $author_query = array('post_type' => 'page', 'posts_per_page' => '-1','author' => $current_user->ID,);
    $author_posts = new WP_Query($author_query);
    $parent_ids = "";
    while($author_posts->have_posts()) : $author_posts->the_post();
        $parent_ids .= get_the_ID() .",";
    endwhile;
   
    return $parent_ids;
}
add_shortcode('get-parents', 'get_parents');

get-parents