diff --git a/application/src/Entity/Attribut/ChildsAttribut.php b/application/src/Entity/Attribut/ChildsAttribut.php
new file mode 100644
index 0000000..6583485
--- /dev/null
+++ b/application/src/Entity/Attribut/ChildsAttribut.php
@@ -0,0 +1,28 @@
+<?php
+namespace App\Entity\Attribut;
+
+use Doctrine\Common\Collections\ArrayCollection;
+/**
+ *
+ * @author kevinfrantz
+ *        
+ */
+trait ChildsAttribut {
+    
+/**
+     * @var ArrayCollection
+     */
+    protected $childs;
+    
+    public function getChilds(): ArrayCollection
+    {
+        return $this->getChilds();
+    }
+    
+    public function setChilds(ArrayCollection $childs): void
+    {
+        $this->childs = $childs;
+    }
+    
+}
+
diff --git a/application/src/Entity/Attribut/ChildsAttributeInterface.php b/application/src/Entity/Attribut/ChildsAttributeInterface.php
new file mode 100644
index 0000000..a8bd3af
--- /dev/null
+++ b/application/src/Entity/Attribut/ChildsAttributeInterface.php
@@ -0,0 +1,15 @@
+<?php
+namespace App\Entity\Attribut;
+use Doctrine\Common\Collections\ArrayCollection;
+/**
+ *
+ * @author kevinfrantz
+ *        
+ */
+interface ChildsAttributeInterface
+{
+    public function setChilds(ArrayCollection $childs):void;
+    
+    public function getChilds():ArrayCollection;
+}
+
diff --git a/application/src/Entity/Attribut/NodeAttribut.php b/application/src/Entity/Attribut/NodeAttribut.php
index b3133b8..1c7704b 100644
--- a/application/src/Entity/Attribut/NodeAttribut.php
+++ b/application/src/Entity/Attribut/NodeAttribut.php
@@ -12,7 +12,7 @@ trait NodeAttribut{
     /**
      * @var NodeInterface
      * @ORM\OneToOne(targetEntity="Node")
-     * @ORM\JoinColumn(name="source", referencedColumnName="id")
+     * @ORM\JoinColumn(name="node_id", referencedColumnName="id")
      */
     protected $node;
     
diff --git a/application/src/Entity/Attribut/ParentAttribut.php b/application/src/Entity/Attribut/ParentAttribut.php
index 1d1b303..0d70389 100644
--- a/application/src/Entity/Attribut/ParentAttribut.php
+++ b/application/src/Entity/Attribut/ParentAttribut.php
@@ -2,7 +2,6 @@
 namespace App\Entity\Attribut;
 
 use Doctrine\Common\Collections\ArrayCollection;
-use App\Entity\NodeInterface;
 
 /**
  *
@@ -10,9 +9,9 @@ use App\Entity\NodeInterface;
  *        
  */
 trait ParentAttribut {
+    
     /**
-     *
-     * @var ArrayCollection|NodeInterface[]
+     * @var ArrayCollection
      */
     protected $parents;
     
diff --git a/application/src/Entity/Node.php b/application/src/Entity/Node.php
index 5419f15..99f41f7 100644
--- a/application/src/Entity/Node.php
+++ b/application/src/Entity/Node.php
@@ -6,6 +6,7 @@ use Doctrine\Common\Collections\ArrayCollection;
 use App\Entity\Attribut\IdAttribut;
 use App\Entity\Attribut\SourceAttribut;
 use App\Entity\Attribut\ParentAttribut;
+use App\Entity\Attribut\ChildsAttribut;
 
 /**
  *
@@ -15,18 +16,28 @@ use App\Entity\Attribut\ParentAttribut;
  */
 class Node implements NodeInterface
 {
-    use IdAttribut,SourceAttribut, ParentAttribut;
+    use IdAttribut,SourceAttribut, ParentAttribut, ChildsAttribut;
     
     /**
-     * 
+     * Many Nodes have many parents
+     * @ORM\ManyToMany(targetEntity="Node")
+     * @ORM\JoinTable(name="nodes_parents",
+     *      joinColumns={@ORM\JoinColumn(name="node_id", referencedColumnName="id")},
+     *      inverseJoinColumns={@ORM\JoinColumn(name="node_id", referencedColumnName="id")}
+     *      )
+     * @var ArrayCollection|Node[]
+     */
+    protected $parents;
+    
+    /**
+     * Many Nodes have many childs
+     * @ORM\ManyToMany(targetEntity="Node")
+     * @ORM\JoinTable(name="nodes_childs",
+     *      joinColumns={@ORM\JoinColumn(name="node_id", referencedColumnName="id")},
+     *      inverseJoinColumns={@ORM\JoinColumn(name="node_id", referencedColumnName="id")}
+     *      )
      * @var ArrayCollection|Node[]
      */
     protected $childs;
-
-    public function getChilds(): ArrayCollection
-    {}
-
-    public function setChilds(ArrayCollection $childs): void
-    {}
 }
 
diff --git a/application/src/Entity/NodeInterface.php b/application/src/Entity/NodeInterface.php
index e1aabf5..f705c53 100644
--- a/application/src/Entity/NodeInterface.php
+++ b/application/src/Entity/NodeInterface.php
@@ -1,20 +1,16 @@
 <?php
 namespace App\Entity;
 
-use Doctrine\Common\Collections\ArrayCollection;
 use App\Entity\Attribut\SourceAttributInterface;
 use App\Entity\Attribut\IdAttributInterface;
 use App\Entity\Attribut\ParentsAttributInterface;
+use App\Entity\Attribut\ChildsAttributeInterface;
 
 /**
  *
  * @author kevinfrantz
  *        
  */
-interface NodeInterface extends SourceAttributInterface, IdAttributInterface,ParentsAttributInterface
-{   
-    public function setChilds(ArrayCollection $childs):void;
-    
-    public function getChilds():ArrayCollection;
-}
+interface NodeInterface extends SourceAttributInterface, IdAttributInterface,ParentsAttributInterface,ChildsAttributeInterface
+{}