Index: taxonomy.views.inc
===================================================================
--- taxonomy.views.inc	(revision 111)
+++ taxonomy.views.inc	(working copy)
@@ -226,6 +226,16 @@
     ),
   );
 
+  $data['term_hierarchy']['parent'] = array(
+    'title' => t('Parent tid'),
+    'help' => t('The tid of the parent term(s).'),
+    'relationship' => array(
+      'base' => 'term_data',
+      'field' => 'parent',
+      'label' => t('Parent'),
+    ),
+  );
+
   // ----------------------------------------------------------------------
   // term_synonym table