diff --git a/geoapi/api/PisApi.php b/geoapi/api/PisApi.php
index 5b17f8a..9f7fecc 100644
--- a/geoapi/api/PisApi.php
+++ b/geoapi/api/PisApi.php
@@ -19,6 +19,12 @@ class PisApi extends Api {
      * @var string
      */
     public static $routeParameterPids = "/pid/:pid+";
+    
+        /**
+     * Route string for the parent paramter
+     * @var string
+     */
+    public static $routeParameterParent = "/parent/:parent";
 
     /**
      * Route string for the iNames paramter
@@ -50,6 +56,12 @@ class PisApi extends Api {
      */
     public static $keyIPatter = "searchPatter";
 
+    /**
+     * Keyword for parendId arguments
+     * @var string
+     */
+    public static $keyParentId = "parendId";
+
     /**
      * max number of pid for each query
      * @var int
@@ -85,20 +97,26 @@ class PisApi extends Api {
         } else {
             $iNameList = array();
         }
-
         if (array_key_exists(self::$keyIPatter, $queryArgs)) {
             $iPatter = trim($queryArgs[self::$keyIPatter]);
         } else {
             $iPatter = "*";
         }
 
+        if (array_key_exists(self::$keyParentId, $queryArgs)) {
+            $parentId = trim($queryArgs[self::$keyParentId]);
+        } else {
+            $parentId = "*";
+        }
+
         if (count($pidList) < self::$maxPid) {
-            $result = $this->sqlManager->sendPisQuery($pidList, $iNameList,$iPatter);
+            $result = $this->sqlManager->sendPisQuery($pidList, $parentId, $iNameList, $iPatter);
 
             return $this->serialManager->arrayToPis($result);
         }
         return NULL;
     }
+
 }
 
 ?>
diff --git a/geoapi/database/PisSqlManager.php b/geoapi/database/PisSqlManager.php
index 9a89d61..9ccefaa 100644
--- a/geoapi/database/PisSqlManager.php
+++ b/geoapi/database/PisSqlManager.php
@@ -61,7 +61,7 @@ class PisSqlManager extends SQLManager {
      * @var string
      */
     private static $orderByTerm = " ORDER BY pid, iName";
-    
+
     /**
      * String for like-Statement fo iValue field
      * @var string 
@@ -74,6 +74,12 @@ class PisSqlManager extends SQLManager {
      */
     private static $pidTerm = "pid = ";
 
+    /**
+     * String for the parent part of the query
+     * @var string
+     */
+    private static $parentTerm = "parent = ";
+
     /**
      * String for the iName part of the query
      * @var string
@@ -105,7 +111,7 @@ class PisSqlManager extends SQLManager {
      * @param array $queryArgs
      * @return array [num][assoc]
      */
-    public function sendPisQuery($pidList, $iNameList, $iPatter = "*") {
+    public function sendPisQuery($pidList, $parentId, $iNameList, $iPatter = "*") {
 
         // build query string
         $query = self::$selectTerm;
@@ -117,6 +123,13 @@ class PisSqlManager extends SQLManager {
             return null;
         }
 
+        if ($parentId != "*" && \utiliy\StringManager::validInt($parentId)) {
+            if ($query != self::$selectTerm) {
+                $query .= self::$andTerm;
+            }
+            $query .= self::$parentTerm . "$parentId";
+        }
+
         if (count($iNameList) > 0 && \utiliy\ArrayManager::validAlphaNumList($iNameList)) {
             if ($query != self::$selectTerm) {
                 $query .= self::$andTerm;
@@ -130,15 +143,15 @@ class PisSqlManager extends SQLManager {
             if ($query != self::$selectTerm) {
                 $query .= self::$andTerm;
             }
-            $query .= self::$iValueLikeTerm ."'%$iPatter%'";
+            $query .= self::$iValueLikeTerm . "'%$iPatter%'";
         }
-        
+
         if ($query == self::$selectTerm) {
             $query = self::$selectAllTerm;
         }
 
         $query .= self::$orderByTerm;
-        
+
         // send query
         return $this->query($query);
     }
diff --git a/geoapi/service/pis/index.php b/geoapi/service/pis/index.php
index 61dd975..506d039 100644
--- a/geoapi/service/pis/index.php
+++ b/geoapi/service/pis/index.php
@@ -10,21 +10,31 @@ $headers = apache_request_headers();
 $app = new \api\PisApi($headers);
 
 // HTTP-Get-Method
-$app->get(\api\PisApi::$routeParameterPids . \api\PisApi::$routeParameterINames . \api\PisApi::$routParameterIPatter, function ($pid, $iNames = array(), $iPatter = "*") use ($app) {
+$app->get(\api\PisApi::$routeParameterPids . \api\PisApi::$routeParameterINames . \api\PisApi::$routParameterIPatter . "(" . \api\PisApi::$routeParameterParent .")", function ($pid, $iNames = array(), $iPatter = "*",$parent = "*") use ($app) {
             $queryArgs = array();
             $queryArgs[\api\PisApi::$keyPidList] = $pid;
             $queryArgs[\api\PisApi::$keyINameList] = $iNames;
             $queryArgs[\api\PisApi::$keyIPatter] = $iPatter;
+            $queryArgs[\api\PisApi::$keyParentId] = $parent;
             echo $app->sendPisQuery($queryArgs);
         });
 
-$app->get(\api\PisApi::$routeParameterPids . \api\PisApi::$routParameterIPatter, function ($pid, $iPatter = "*") use ($app) {
+$app->get(\api\PisApi::$routeParameterPids . \api\PisApi::$routParameterIPatter . "(" . \api\PisApi::$routeParameterParent .")", function ($pid, $iPatter = "*",$parent = "*") use ($app) {
             $queryArgs = array();
             $queryArgs[\api\PisApi::$keyPidList] = $pid;
             $queryArgs[\api\PisApi::$keyIPatter] = $iPatter;
+            $queryArgs[\api\PisApi::$keyParentId] = $parent;
             echo $app->sendPisQuery($queryArgs);
         });
 
+$app->get(\api\PisApi::$routeParameterPids . \api\PisApi::$routeParameterINames . \api\PisApi::$routeParameterParent, function ($pid, $iNames = array(), $parent = "*") use ($app) {
+            $queryArgs = array();
+            $queryArgs[\api\PisApi::$keyPidList] = $pid;
+            $queryArgs[\api\PisApi::$keyINameList] = $iNames;
+            $queryArgs[\api\PisApi::$keyParentId] = $parent;
+            echo $app->sendPisQuery($queryArgs);
+        });
+        
 $app->get(\api\PisApi::$routeParameterPids . \api\PisApi::$routeParameterINames, function ($pid, $iNames = array()) use ($app) {
             $queryArgs = array();
             $queryArgs[\api\PisApi::$keyPidList] = $pid;
@@ -32,6 +42,13 @@ $app->get(\api\PisApi::$routeParameterPids . \api\PisApi::$routeParameterINames,
             echo $app->sendPisQuery($queryArgs);
         });
 
+$app->get(\api\PisApi::$routeParameterPids . \api\PisApi::$routeParameterParent, function ($pid, $parent = "*") use ($app) {
+            $queryArgs = array();
+            $queryArgs[\api\PisApi::$keyPidList] = $pid;
+            $queryArgs[\api\PisApi::$keyParentId] = $parent;
+            echo $app->sendPisQuery($queryArgs);
+        });
+
 $app->get(\api\PisApi::$routeParameterPids, function ($pid) use ($app) {
             $queryArgs = array();
             $queryArgs[\api\PisApi::$keyPidList] = $pid;
diff --git a/geoapi/utility/ArrayManager.php b/geoapi/utility/ArrayManager.php
index ff76b62..c270310 100644
--- a/geoapi/utility/ArrayManager.php
+++ b/geoapi/utility/ArrayManager.php
@@ -47,8 +47,7 @@ class ArrayManager {
      */
     public static function validIntList($list) {
         foreach ($list as $value) {
-
-            if (!ctype_digit($value) || PHP_INT_MAX < $value) {
+            if (!StringManager::validInt($value)) {
                 return FALSE;
             }
         }
diff --git a/geoapi/utility/StringManager.php b/geoapi/utility/StringManager.php
index a424cb8..e178ff0 100644
--- a/geoapi/utility/StringManager.php
+++ b/geoapi/utility/StringManager.php
@@ -54,6 +54,18 @@ class StringManager {
         }
         return FALSE;
     }
+    
+        /**
+     * Method if the string is in integor
+     * @param string $value
+     * @return boolean
+     */
+    public static function validInt($value) {
+       if (!ctype_digit($value) || PHP_INT_MAX < $value) {
+                return FALSE;
+        }
+        return TRUE;
+    }
 
 }