Remove default titles in Genesis

functions.php

<?php

/* Remove default titles 
------------------------------------------------------------ */

add_action( 'get_header', 'child_remove_page_titles' );
function child_remove_page_titles() {
    if ( is_page() && ! is_page_template( 'page_blog.php') || $post->post_parent ) {
  	    remove_action( 'genesis_entry_header', 'genesis_entry_header_markup_open', 5 );
        remove_action( 'genesis_entry_header', 'genesis_entry_header_markup_close', 15 );
        remove_action( 'genesis_entry_header', 'genesis_do_post_title' );
		}
}