Breadcrumb how i can display page title with parent > child title with permalink ? any Idea

You should change this line:

echo "post_parent)."\">".get_the_title($post->post_parent) . "";

To something like this:

echo '<a href="'. get_permalink($post->post_parent).'">'. apply_filters('the_title', get_the_title($post->post_parent)) .'</a>';