diff --git a/biscuit/core/models.py b/biscuit/core/models.py
index 81939e4144776d4b67e51e2c9e14d649bcae0be6..38043f6839c4e1f3c4a9e2ad740228bf2c0a2857 100644
--- a/biscuit/core/models.py
+++ b/biscuit/core/models.py
@@ -26,5 +26,8 @@ class Person(AbstractUser):
 
     import_ref = models.CharField(max_length=64)
 
+    guardians = models.ManyToManyField(
+        'self', symmetrical=False, related_name='children')
+
     def __str__(self):
         return '%s, %s' % (self.last_name, self.first_name)