$term_id = get_queried_object()->parent ;
$taxonomy_name = get_queried_object()->taxonomy;
foreach ( get_term_children( $term_id ,$taxonomy_name ) as $child ) {
$term = get_term_by( 'id', $child, $taxonomy_name );
echo '<li><a href="' . get_term_link( $child, $taxonomy_name ) . '">' . $term->name . '</a></li>';
}