diff --git a/app/Models/CaCertificate.php b/app/Models/CaCertificate.php
index 2b23664..44ea8d9 100644
--- a/app/Models/CaCertificate.php
+++ b/app/Models/CaCertificate.php
@@ -26,6 +26,7 @@ class CaCertificate extends Model
         'is_latest',
         'issuer_name',
         'issuer_serial',
+        'family_id',
         'cert_path',
         'der_path',
         'bat_path',
diff --git a/app/Services/OpenSslService.php b/app/Services/OpenSslService.php
index 7774b45..95caac4 100644
--- a/app/Services/OpenSslService.php
+++ b/app/Services/OpenSslService.php
@@ -418,6 +418,7 @@ class OpenSslService
                 'valid_to' => date('Y-m-d H:i:s', $newInfo['validTo_time_t']),
                 'issuer_name' => $cert->ca_type === 'root' ? $cert->common_name : ($root ? $root->common_name : 'Unknown Root'),
                 'issuer_serial' => $cert->ca_type === 'root' ? $newSerialHex : ($root ? $root->serial_number : null),
+                'family_id' => $cert->ca_type === 'root' ? (string) \Illuminate\Support\Str::uuid() : ($root ? $root->family_id : $cert->family_id),
             ];
 
         } finally {
@@ -477,6 +478,7 @@ class OpenSslService
             'valid_to' => $newData['valid_to'],
             'issuer_name' => $newData['issuer_name'],
             'issuer_serial' => $newData['issuer_serial'],
+            'family_id' => $newData['family_id'],
             'is_latest' => true,
         ]);
 
diff --git a/database/migrations/2025_12_23_123913_create_ca_certificates_table.php b/database/migrations/2025_12_23_123913_create_ca_certificates_table.php
index 5580568..d62f92e 100644
--- a/database/migrations/2025_12_23_123913_create_ca_certificates_table.php
+++ b/database/migrations/2025_12_23_123913_create_ca_certificates_table.php
@@ -33,6 +33,7 @@ return new class extends Migration
                 $table->string('organization')->nullable();
                 $table->string('issuer_name')->nullable();
                 $table->string('issuer_serial')->nullable();
+                $table->string('family_id')->nullable();
                 $table->dateTime('valid_from')->nullable();
                 $table->dateTime('valid_to')->nullable();
                 
@@ -70,6 +71,9 @@ return new class extends Migration
                 if (!Schema::connection('mysql_ca')->hasColumn('ca_certificates', 'issuer_serial')) {
                     $table->string('issuer_serial')->nullable()->after('issuer_name');
                 }
+                if (!Schema::connection('mysql_ca')->hasColumn('ca_certificates', 'family_id')) {
+                    $table->string('family_id')->nullable()->after('issuer_serial');
+                }
             });
         }
     }