diff --git a/app/migrations/0046_alter_keyword_mother.py b/app/migrations/0046_alter_keyword_mother.py
new file mode 100644
index 0000000..84ab1a8
--- /dev/null
+++ b/app/migrations/0046_alter_keyword_mother.py
@@ -0,0 +1,19 @@
+# Generated by Django 3.2.5 on 2021-11-29 01:58
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('app', '0045_auto_20211128_1636'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='keyword',
+            name='mother',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.DO_NOTHING, related_name='mother_keyword', to='app.keyword'),
+        ),
+    ]
diff --git a/app/models.py b/app/models.py
index 349b54a..4468742 100644
--- a/app/models.py
+++ b/app/models.py
@@ -480,11 +480,12 @@ class ImportGeom210915(models.Model):
 
 class Keyword(models.Model):
     keyword_id = models.AutoField(primary_key=True)
-    mother = models.TextField(blank=True, null=True)
+    mother = models.ForeignKey("self", models.DO_NOTHING, blank=True, null=True, to_field='keyword_id',
+                               related_name='mother_keyword')
     keyword = models.TextField(blank=True, null=True)
     
     def __str__(self):
-        return '%s - %s' % (self.keyword, self.mother)
+        return '%s > %s' % (self.mother, self.keyword)
     
 
 class ResourceKeyword(models.Model):