diff --git i/field_group.module w/field_group.module
index 357a917..641ea03 100644
--- i/field_group.module
+++ w/field_group.module
@@ -2034,6 +2034,9 @@ function field_group_fields_nest(&$element, &$vars = NULL) {
       }
       $group_references[$group_name]['#array_parents'] = $parents;
       $element['#fieldgroups'][$group_name]->array_parents = $parents;
+      // Remove self from parents and set #field_parents
+      array_pop($parents);
+      $group_references[$group_name]['#field_parents'] = $parents;
     }
   }
 
@@ -2084,18 +2087,17 @@ function field_group_fields_nest(&$element, &$vars = NULL) {
         // list intact (but if it is a field we don't mind).
         $group_references[$parent_name][$child_name] = &$element[$child_name];
         $group_references[$parent_name]['#weight'] = $element['#fieldgroups'][$parent_name]->weight;
-        // Set #array_parents of group child element
+        // Prepend #array_parents & #field_parents of group child element & its element_children, if set
         $group_child = &$group_references[$parent_name][$child_name];
         $group_parents = $group_references[$parent_name]['#array_parents'];
-        if (isset($group_child['#array_parents'])) {
-          // array_unique in case it's already prepended ... somehow
-          $group_child['#array_parents'] = array_unique(array_merge($group_parents, $group_child['#array_parents']));
-        }
-        // And recursively for element's children
-        foreach (_element_children_recursive_ref($group_child) as &$group_child_child) {
-          if (isset($group_child_child['#array_parents'])) {
-            $group_child_child['#array_parents'] = array_unique(array_merge($group_parents, $group_child['#array_parents']));
-          }          
+        $process_elements = array_merge(array(&$group_child), _element_children_recursive_ref($group_child));
+        foreach ($process_elements as $key => $current_element) {
+          if (isset($current_element['#array_parents'])) {
+            $process_elements[$key]['#array_parents'] = array_merge($group_parents, $current_element['#array_parents']);
+          }
+          if (isset($current_element['#field_parents'])) {
+            $process_elements[$key]['#field_parents'] = array_merge($group_parents, $current_element['#field_parents']);
+          }
         }
       }