diff --git a/application/src/Entity/Meta/AbstractMeta.php b/application/src/Entity/Meta/AbstractMeta.php
index 9958107..d23cce2 100644
--- a/application/src/Entity/Meta/AbstractMeta.php
+++ b/application/src/Entity/Meta/AbstractMeta.php
@@ -3,12 +3,27 @@
 namespace App\Entity\Meta;
 
 use App\Entity\AbstractEntity;
+use App\Entity\Attribut\SourceAttribut;
+use App\Entity\Source\SourceInterface;
+use Doctrine\ORM\Mapping as ORM;
 
 /**
+ * @todo Implement source attribut
+ *
  * @author kevinfrantz
  */
 abstract class AbstractMeta extends AbstractEntity implements MetaInterface
 {
+    use SourceAttribut;
+
+    /**
+     * @ORM\OneToOne(targetEntity="App\Entity\Source\AbstractSource",cascade={"persist", "remove"})
+     * @ORM\JoinColumn(name="source_id", referencedColumnName="id",onDelete="CASCADE")
+     *
+     * @var SourceInterface
+     */
+    protected $source;
+
     public function __construct()
     {
         parent::__construct();
diff --git a/application/src/Entity/Meta/MetaInterface.php b/application/src/Entity/Meta/MetaInterface.php
index 9caf7a5..a747647 100644
--- a/application/src/Entity/Meta/MetaInterface.php
+++ b/application/src/Entity/Meta/MetaInterface.php
@@ -3,6 +3,7 @@
 namespace App\Entity\Meta;
 
 use App\Entity\EntityInterface;
+use App\Entity\Attribut\SourceAttributInterface;
 
 /**
  * Meta entities contain informations which describe sources.
@@ -10,6 +11,6 @@ use App\Entity\EntityInterface;
  *
  * @author kevinfrantz
  */
-interface MetaInterface extends EntityInterface
+interface MetaInterface extends EntityInterface, SourceAttributInterface
 {
 }
diff --git a/application/src/Entity/Meta/Relation.php b/application/src/Entity/Meta/Relation.php
deleted file mode 100644
index 9f7be55..0000000
--- a/application/src/Entity/Meta/Relation.php
+++ /dev/null
@@ -1,78 +0,0 @@
-<?php
-
-namespace App\Entity\Meta;
-
-use Doctrine\ORM\Mapping as ORM;
-use App\Entity\Attribut\IdAttribut;
-use App\Entity\Attribut\SourceAttribut;
-use App\Entity\Attribut\ParentsAttribut;
-use App\Entity\Attribut\ChildsAttribut;
-use App\Entity\Attribut\LawAttribut;
-use Doctrine\Common\Collections\ArrayCollection;
-use App\Entity\Source\SourceInterface;
-use Doctrine\Common\Collections\Collection;
-
-/**
- * This class represents a relation.
- * A relationship represents the creators and the created objects.
- *
- * @author kevinfrantz
- *
- * @todo rename and refactor this class
- * @ORM\Table(name="meta_relation")
- * @ORM\Entity()
- */
-class Relation extends AbstractMeta implements RelationInterface
-{
-    use IdAttribut,
-    SourceAttribut,
-    ParentsAttribut,
-    LawAttribut,
-    ChildsAttribut;
-
-    /**
-     * Parents represent the creators of the relation.
-     *
-     * @ORM\ManyToMany(targetEntity="Relation",mappedBy="childs")
-     *
-     * @var Collection|RelationInterface[]
-     */
-    protected $parents;
-
-    /**
-     * Childs represent the by the object produced relations.
-     *
-     * @ORM\ManyToMany(targetEntity="Relation",inversedBy="parents")
-     * @ORM\JoinTable(name="meta_relation_childs",
-     *      joinColumns={@ORM\JoinColumn(name="relation_id", referencedColumnName="id")},
-     *      inverseJoinColumns={@ORM\JoinColumn(name="child_id", referencedColumnName="id")}
-     *      )
-     *
-     * @var Collection|RelationInterface[]
-     */
-    protected $childs;
-
-    /**
-     * @ORM\OneToOne(targetEntity="App\Entity\Source\AbstractSource",cascade={"persist", "remove"})
-     * @ORM\JoinColumn(name="source_id", referencedColumnName="id",onDelete="CASCADE")
-     *
-     * @var SourceInterface
-     */
-    protected $source;
-
-    /**
-     * @ORM\OneToOne(targetEntity="Law",cascade={"persist", "remove"})
-     * @ORM\JoinColumn(name="law_id", referencedColumnName="id",onDelete="CASCADE")
-     *
-     * @var LawInterface
-     */
-    protected $law;
-
-    public function __construct()
-    {
-        parent::__construct();
-        $this->law = new Law();
-        $this->parents = new ArrayCollection();
-        $this->childs = new ArrayCollection();
-    }
-}
diff --git a/application/src/Entity/Meta/Relation/AbstractRelation.php b/application/src/Entity/Meta/Relation/AbstractRelation.php
new file mode 100644
index 0000000..cfd97fd
--- /dev/null
+++ b/application/src/Entity/Meta/Relation/AbstractRelation.php
@@ -0,0 +1,16 @@
+<?php
+
+namespace App\Entity\Meta\Relation;
+
+use App\Entity\Meta\AbstractMeta;
+
+/**
+ * @author kevinfrantz
+ */
+abstract class AbstractRelation extends AbstractMeta implements RelationInterface
+{
+    public function __construct()
+    {
+        parent::__construct();
+    }
+}
diff --git a/application/src/Entity/Meta/Relation/Member/MemberRelation.php b/application/src/Entity/Meta/Relation/Member/MemberRelation.php
new file mode 100644
index 0000000..3d5076b
--- /dev/null
+++ b/application/src/Entity/Meta/Relation/Member/MemberRelation.php
@@ -0,0 +1,12 @@
+<?php
+
+namespace App\Entity\Meta\Relation\Member;
+
+use App\Entity\Meta\Relation\AbstractRelation;
+use App\Entity\Attribut\MembersAttribut;
+use App\Entity\Attribut\MembershipsAttribut;
+
+class MemberRelation extends AbstractRelation implements MemberRelationInterface
+{
+    use MembersAttribut,MembershipsAttribut;
+}
diff --git a/application/src/Entity/Meta/Relation/Member/MemberRelationInterface.php b/application/src/Entity/Meta/Relation/Member/MemberRelationInterface.php
new file mode 100644
index 0000000..f9b87aa
--- /dev/null
+++ b/application/src/Entity/Meta/Relation/Member/MemberRelationInterface.php
@@ -0,0 +1,11 @@
+<?php
+
+namespace App\Entity\Meta\Relation\Member;
+
+use App\Entity\Meta\Relation\RelationInterface;
+use App\Entity\Attribut\MembersAttributInterface;
+use App\Entity\Attribut\MembershipsAttributInterface;
+
+interface MemberRelationInterface extends RelationInterface, MembersAttributInterface, MembershipsAttributInterface
+{
+}
\ No newline at end of file
diff --git a/application/src/Entity/Meta/Relation/Parent/AbstractParentRelation.php b/application/src/Entity/Meta/Relation/Parent/AbstractParentRelation.php
new file mode 100644
index 0000000..2fc09b8
--- /dev/null
+++ b/application/src/Entity/Meta/Relation/Parent/AbstractParentRelation.php
@@ -0,0 +1,28 @@
+<?php
+
+namespace App\Entity\Meta\Relation\Parent;
+
+use App\Entity\Attribut\IdAttribut;
+use App\Entity\Attribut\ParentsAttribut;
+use App\Entity\Attribut\ChildsAttribut;
+use Doctrine\Common\Collections\ArrayCollection;
+use App\Entity\Meta\Relation\AbstractRelation;
+
+/**
+ * This class represents a relation.
+ *
+ * @author kevinfrantz
+ */
+abstract class AbstractParentRelation extends AbstractRelation implements ParentRelationInterface
+{
+    use IdAttribut,
+    ParentsAttribut,
+    ChildsAttribut;
+
+    public function __construct()
+    {
+        parent::__construct();
+        $this->parents = new ArrayCollection();
+        $this->childs = new ArrayCollection();
+    }
+}
diff --git a/application/src/Entity/Meta/Relation/Parent/CreatorRelation.php b/application/src/Entity/Meta/Relation/Parent/CreatorRelation.php
new file mode 100644
index 0000000..79c0d10
--- /dev/null
+++ b/application/src/Entity/Meta/Relation/Parent/CreatorRelation.php
@@ -0,0 +1,28 @@
+<?php
+
+namespace App\Entity\Meta\Relation\Parent;
+
+use Doctrine\ORM\Mapping as ORM;
+use Doctrine\Common\Collections\Collection;
+use App\Entity\Meta\Relation\CreatorRelationInterface;
+
+class CreatorRelation extends AbstractParentRelation
+{
+    /**
+     * @ORM\ManyToMany(targetEntity="CreatorRelation",mappedBy="childs")
+     *
+     * @var Collection|CreatorRelationInterface[]
+     */
+    protected $parents;
+
+    /**
+     * @ORM\ManyToMany(targetEntity="CreatorRelation",inversedBy="parents")
+     * @ORM\JoinTable(name="meta_relation_childs",
+     *      joinColumns={@ORM\JoinColumn(name="relation_id", referencedColumnName="id")},
+     *      inverseJoinColumns={@ORM\JoinColumn(name="child_id", referencedColumnName="id")}
+     *      )
+     *
+     * @var Collection|CreatorRelationInterface[]
+     */
+    protected $childs;
+}
diff --git a/application/src/Entity/Meta/Relation/Parent/CreatorRelationInterface.php b/application/src/Entity/Meta/Relation/Parent/CreatorRelationInterface.php
new file mode 100644
index 0000000..fba4216
--- /dev/null
+++ b/application/src/Entity/Meta/Relation/Parent/CreatorRelationInterface.php
@@ -0,0 +1,7 @@
+<?php
+
+namespace App\Entity\Meta\Relation;
+
+interface CreatorRelationInterface extends RelationInterface
+{
+}
diff --git a/application/src/Entity/Meta/Relation/Parent/HeredityRelation.php b/application/src/Entity/Meta/Relation/Parent/HeredityRelation.php
new file mode 100644
index 0000000..154e727
--- /dev/null
+++ b/application/src/Entity/Meta/Relation/Parent/HeredityRelation.php
@@ -0,0 +1,32 @@
+<?php
+
+namespace App\Entity\Meta\Relation\Parent;
+
+use Doctrine\Common\Collections\Collection;
+use Doctrine\ORM\Mapping as ORM;
+
+class HeredityRelation extends AbstractParentRelation implements HeredityRelationInterface
+{
+    /**
+     * Parents represent from which inhieres.
+     *
+     * @ORM\ManyToMany(targetEntity="HeredityRelation",mappedBy="childs")
+     *
+     * @var Collection|HeredityRelationInterface[]
+     */
+    protected $parents;
+
+    /**
+     * Childs represent the by the object produced relations.
+     *
+     * @ORM\ManyToMany(targetEntity="HeredityRelation",inversedBy="parents")
+     * @ORM\JoinTable(
+     *      joinColumns={
+     *      @ORM\JoinColumn(name="relation_id", referencedColumnName="id")},
+     *      inverseJoinColumns={@ORM\JoinColumn(name="child_id", referencedColumnName="id")}
+     *      )
+     *
+     * @var Collection|HeredityRelationInterface[]
+     */
+    protected $childs;
+}
diff --git a/application/src/Entity/Meta/Relation/Parent/HeredityRelationInterface.php b/application/src/Entity/Meta/Relation/Parent/HeredityRelationInterface.php
new file mode 100644
index 0000000..df078d9
--- /dev/null
+++ b/application/src/Entity/Meta/Relation/Parent/HeredityRelationInterface.php
@@ -0,0 +1,7 @@
+<?php
+
+namespace App\Entity\Meta\Relation\Parent;
+
+interface HeredityRelationInterface extends ParentRelationInterface
+{
+}
diff --git a/application/src/Entity/Meta/Relation/Parent/ParentRelationInterface.php b/application/src/Entity/Meta/Relation/Parent/ParentRelationInterface.php
new file mode 100644
index 0000000..3753ba1
--- /dev/null
+++ b/application/src/Entity/Meta/Relation/Parent/ParentRelationInterface.php
@@ -0,0 +1,11 @@
+<?php
+
+namespace App\Entity\Meta\Relation\Parent;
+
+use App\Entity\Attribut\ParentsAttributInterface;
+use App\Entity\Attribut\ChildsAttributeInterface;
+use App\Entity\Meta\Relation\RelationInterface;
+
+interface ParentRelationInterface extends RelationInterface, ParentsAttributInterface, ChildsAttributeInterface
+{
+}
diff --git a/application/src/Entity/Meta/Relation/RelationInterface.php b/application/src/Entity/Meta/Relation/RelationInterface.php
new file mode 100644
index 0000000..cf7b997
--- /dev/null
+++ b/application/src/Entity/Meta/Relation/RelationInterface.php
@@ -0,0 +1,14 @@
+<?php
+
+namespace App\Entity\Meta\Relation;
+
+use App\Entity\Meta\MetaInterface;
+
+/**
+ * Describes a relation of a source to another source.
+ *
+ * @author kevinfrantz
+ */
+interface RelationInterface extends MetaInterface
+{
+}
diff --git a/application/src/Entity/Meta/RelationInterface.php b/application/src/Entity/Meta/RelationInterface.php
deleted file mode 100644
index bc384db..0000000
--- a/application/src/Entity/Meta/RelationInterface.php
+++ /dev/null
@@ -1,16 +0,0 @@
-<?php
-
-namespace App\Entity\Meta;
-
-use App\Entity\Attribut\SourceAttributInterface;
-use App\Entity\Attribut\IdAttributInterface;
-use App\Entity\Attribut\ParentsAttributInterface;
-use App\Entity\Attribut\ChildsAttributeInterface;
-use App\Entity\Attribut\LawAttributInterface;
-
-/**
- * @author kevinfrantz
- */
-interface RelationInterface extends SourceAttributInterface, IdAttributInterface, ParentsAttributInterface, ChildsAttributeInterface, LawAttributInterface, MetaInterface
-{
-}