diff --git a/src/function/cleanup/delete-families.ts b/src/function/cleanup/delete-families.ts
index 514a553..b5856a6 100644
--- a/src/function/cleanup/delete-families.ts
+++ b/src/function/cleanup/delete-families.ts
@@ -1,6 +1,6 @@
 /*
  * server component for the TimeLimit App
- * Copyright (C) 2019 - 2022 Jonas Lochmann
+ * Copyright (C) 2019 - 2023 Jonas Lochmann
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU Affero General Public License as
@@ -79,6 +79,16 @@ export async function deleteFamilies ({ database, familiyIds }: {
       transaction
     })
 
+    // session durations
+    await database.sessionDuration.destroy({
+      where: {
+        familyId: {
+          [Sequelize.Op.in]: familiyIds
+        }
+      },
+      transaction
+    })
+
     // user
     await database.user.destroy({
       where: {