diff --git a/plugins/tasklist/drivers/kolab/tasklist_kolab_driver.php b/plugins/tasklist/drivers/kolab/tasklist_kolab_driver.php
index 4a192c66..8ba59dec 100644
--- a/plugins/tasklist/drivers/kolab/tasklist_kolab_driver.php
+++ b/plugins/tasklist/drivers/kolab/tasklist_kolab_driver.php
@@ -796,6 +796,7 @@ class tasklist_kolab_driver extends tasklist_driver
                 'attendee' => 'attendees',
                 'attach'   => 'attachments',
                 'rrule'    => 'recurrence',
+                'related-to' => 'parent_id',
                 'percent-complete' => 'complete',
                 'lastmodified-date' => 'changed',
             );
diff --git a/plugins/tasklist/skins/larry/tasklist.css b/plugins/tasklist/skins/larry/tasklist.css
index a39c1f25..33987f28 100644
--- a/plugins/tasklist/skins/larry/tasklist.css
+++ b/plugins/tasklist/skins/larry/tasklist.css
@@ -882,7 +882,7 @@ ul.toolbarmenu .sortcol.by-auto a {
 	background: url(images/badge_cancelled.png) top right no-repeat;
 }
 
-#task-parent-title {
+.task-parent-title {
 	position: relative;
 	top: -0.6em;
 }
diff --git a/plugins/tasklist/skins/larry/templates/mainview.html b/plugins/tasklist/skins/larry/templates/mainview.html
index dd384094..3a3a227d 100644
--- a/plugins/tasklist/skins/larry/templates/mainview.html
+++ b/plugins/tasklist/skins/larry/templates/mainview.html
@@ -163,7 +163,7 @@
 
 
 <div id="taskshow" class="taskshow">
-	<div class="form-section" id="task-parent-title"></div>
+	<div id="task-parent-title" class="form-section task-parent-title"></div>
 	<div class="form-section">
 		<h2 id="task-title"></h2>
 	</div>
@@ -249,6 +249,10 @@
 </div>
 
 <div id="taskdiff" class="uidialog taskshow" aria-hidden="true">
+	<div class="form-section task-parent-title">
+		<span class="task-text-old"></span> &#8674;
+		<span class="task-text-new"></span> &raquo;
+	</div>
 	<h2 class="task-title">Task Title</h2>
 	<h2 class="task-title-new task-text-new"></h2>
 	<div class="form-section task-description">
diff --git a/plugins/tasklist/tasklist.php b/plugins/tasklist/tasklist.php
index b4cdfa21..869a1926 100644
--- a/plugins/tasklist/tasklist.php
+++ b/plugins/tasklist/tasklist.php
@@ -450,6 +450,16 @@ class tasklist extends rcube_plugin
                             $change['new']['classname'] = rcube_utils::file2class($change['new']['mimetype'], $change['new']['name']);
                         }
                     }
+                    // resolve parent_id to the refered task title for display
+                    if ($change['property'] == 'parent_id') {
+                        $change['property'] = 'parent-title';
+                        if (!empty($change['old']) && ($old_parent = $this->driver->get_task(array('id' => $change['old'], 'list' => $rec['list'])))) {
+                            $change['old_'] = $old_parent['title'];
+                        }
+                        if (!empty($change['new']) && ($new_parent = $this->driver->get_task(array('id' => $change['new'], 'list' => $rec['list'])))) {
+                            $change['new_'] = $new_parent['title'];
+                        }
+                    }
                     // compute a nice diff of description texts
                     if ($change['property'] == 'description') {
                         $change['diff_'] = libkolab::html_diff($change['old'], $change['new']);
@@ -1272,12 +1282,17 @@ class tasklist extends rcube_plugin
     private function task_walk_tree(&$rec)
     {
         $rec['_depth'] = 0;
+        $parent_titles = array();
         $parent_id = $this->task_tree[$rec['id']];
         while ($parent_id) {
             $rec['_depth']++;
-            $rec['parent_title'] = $this->task_titles[$parent_id];
+            array_unshift($parent_titles, $this->task_titles[$parent_id]);
             $parent_id = $this->task_tree[$parent_id];
         }
+
+        if (count($parent_titles)) {
+            $rec['parent_title'] = join(' » ', array_filter($parent_titles));
+        }
     }
 
     /**