Sample Custom Page with nested different post types e.g: /broker/member-name/contact/

sample-nested-post-types.php

add_shortcode('broker_init', function(){
    ob_start();
    include 'broker/init.php';
    return ob_get_clean();
});

add_action('init', 'custom_rewrite_rules');
function custom_rewrite_rules(){
    add_rewrite_rule(
		'^broker/([\w+-]*)/([\w+-]*)/?$',
		'index.php?pagename=broker&broker_slug=$matches[1]&broker_page_slug=$matches[2]',
		'top'
	);
    add_rewrite_rule(
		'^broker/([\w+-]*)/?$',
		'index.php?pagename=broker&broker_slug=$matches[1]',
		'top'
	);
}

add_filter( 'query_vars', 'custom_query_vars');
function custom_query_vars($query_vars){
    $custom_vars = [
		'broker_slug',
		'broker_page_slug',
	];
	foreach( $custom_vars as $custom_var ) {
		$query_vars[] = $custom_var;
	}
    return $query_vars;
}