diff --git a/academic_sale_subscription/models/account_move.py b/academic_sale_subscription/models/account_move.py
index 3866e51a..549cf05d 100644
--- a/academic_sale_subscription/models/account_move.py
+++ b/academic_sale_subscription/models/account_move.py
@@ -57,14 +57,12 @@ def _compute_student_ids(self):
 
     def _post(self, soft=True):
         for rec in self:
-            partners_invoice = rec.student_id.payment_responsible_ids if rec.student_id else self.env["res.partner"]
-            rec.message_subscribe(
-                [
-                    payment_responsible.id
-                    for payment_responsible in rec.partner_id | partners_invoice
-                    if payment_responsible not in rec.sudo().message_partner_ids
-                ]
-            )
+            if rec.student_id:
+                family_partners = rec.student_id.student_link_ids.mapped("partner_id")
+                partners_to_subscribe = rec.partner_id | family_partners
+                to_subscribe = partners_to_subscribe - rec.sudo().message_partner_ids
+                if to_subscribe:
+                    rec.message_subscribe(partner_ids=to_subscribe.ids)
         return super()._post(soft=soft)
 
     def _compute_is_academic_sale(self):
diff --git a/academic_sale_subscription/models/sale_order.py b/academic_sale_subscription/models/sale_order.py
index 26248640..2b367c21 100644
--- a/academic_sale_subscription/models/sale_order.py
+++ b/academic_sale_subscription/models/sale_order.py
@@ -56,13 +56,12 @@ def _prepare_invoice(self):
     def create(self, vals_list):
         orders = super().create(vals_list)
         for order in orders.filtered("is_academic_sale"):
-            order.message_subscribe(
-                [
-                    payment_responsible.id
-                    for payment_responsible in order.partner_invoice_id | order.partner_invoice_ids
-                    if payment_responsible not in order.sudo().message_partner_ids
-                ]
-            )
+            if order.partner_id:
+                family_partners = order.partner_id.student_link_ids.mapped("partner_id")
+                partners_to_subscribe = order.partner_invoice_id | family_partners
+                to_subscribe = partners_to_subscribe - order.sudo().message_partner_ids
+                if to_subscribe:
+                    order.message_subscribe(partner_ids=to_subscribe.ids)
         return orders
 
     def _message_get_default_recipients(self):