gistfile1.txt

<?php
			$category = get_the_category();
			print_r($category);
			$parent = get_cat_name($category[0]->category_parent);
			if (!empty($parent)) {
			echo $parent;
			} else {
			echo $category[0]->cat_name;
			}
			?></h1>
        <ul>
        <?php
			if ( is_category() ) {
			  $current_cat = get_query_var('cat');
			  wp_list_categories('hide_empty=&title_li=&child_of='.$current_cat);
			}
		?>