List children on child post

I have a custom post type with children posts. If I'm viewing one of the children post how can I list other children posts that uses the same parent?

 

can you tell me the code? I'm not really a programmer

 

Here's the function on how my custom post type is registered

add_action( 'init', 'register_cpt_episode' );

function register_cpt_episode() {

$labels = array(
'name' => _x( 'Episodes', 'episode' ),
'singular_name' => _x( 'Episode', 'episode' ),
'add_new' => _x( 'Add New', 'episode' ),
'add_new_item' => _x( 'Add New Episode', 'episode' ),
'edit_item' => _x( 'Edit Episode', 'episode' ),
'new_item' => _x( 'New Episode', 'episode' ),
'view_item' => _x( 'View Episode', 'episode' ),
'search_items' => _x( 'Search Episodes', 'episode' ),
'not_found' => _x( 'No episodes found', 'episode' ),
'not_found_in_trash' => _x( 'No episodes found in Trash', 'episode' ),
'parent_item_colon' => _x( 'Parent Episode:', 'episode' ),
'menu_name' => _x( 'Episodes', 'episode' ),
);

$args = array(
'labels' => $labels,
'hierarchical' => true,

'supports' => array( 'title', 'editor', 'thumbnail', 'custom-fields', 'comments' ),
'taxonomies' => array( 'category', 'post_tag' ),
'public' => true,
'show_ui' => true,
'show_in_menu' => true,


'show_in_nav_menus' => true,
'publicly_queryable' => true,
'exclude_from_search' => false,
'has_archive' => true,
'query_var' => true,
'can_export' => true,
'rewrite' => true,
'capability_type' => 'post'
);

register_post_type( 'episode', $args );
}

Code (markup):