diff --git a/golem_member_minor/models/res_partner.py b/golem_member_minor/models/res_partner.py
new file mode 100644
index 0000000..5b93626
--- /dev/null
+++ b/golem_member_minor/models/res_partner.py
@@ -0,0 +1,36 @@
+# -*- coding: utf-8 -*-
+
+#    Copyright 2017-2018 Fabien Bourgeois <fabien@yaltik.com>
+#
+#    This program is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU Affero General Public License as
+#    published by the Free Software Foundation, either version 3 of the
+#    License, or (at your option) any later version.
+#
+#    This program is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU Affero General Public License for more details.
+#
+#    You should have received a copy of the GNU Affero General Public License
+#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+""" GOLEM Member Minor management """
+
+from datetime import date, timedelta
+from odoo import models, fields, api
+
+ADULT_DURATION = timedelta(days=365.25*18)
+
+class GolemMember(models.Model):
+    """ GOLEM Member adaptations """
+    _inherit = 'res.partner'
+
+    is_default_gardian = fields.Boolean()
+
+
+    def do_default_gardian(self):
+        """ make only default gardian """
+        self.ensure_one()
+        self.is_default_gardian = True
+        member_id = self._context.get('member_id', False)