diff --git a/changelog/+query-groups-typed-members-accessor.housekeeping.md b/changelog/+query-groups-typed-members-accessor.housekeeping.md
new file mode 100644
index 00000000..0e6eeeca
--- /dev/null
+++ b/changelog/+query-groups-typed-members-accessor.housekeeping.md
@@ -0,0 +1 @@
+Routed the two remaining `existing_group.members.peer_ids` accesses in `infrahub_sdk/query_groups.py` through the typed `_get_relationship_many(name="members")` accessor, removing the last two `# type: ignore[union-attr]` suppressions in that module. Internal typing hygiene with no behavioural change.
diff --git a/infrahub_sdk/query_groups.py b/infrahub_sdk/query_groups.py
index cc7faebd..3fcde346 100644
--- a/infrahub_sdk/query_groups.py
+++ b/infrahub_sdk/query_groups.py
@@ -175,7 +175,9 @@ async def update_group(self) -> None:
             return
 
         # Calculate how many nodes should be deleted
-        self.unused_member_ids = list(set(existing_group.members.peer_ids) - set(members))  # type: ignore[union-attr]
+        self.unused_member_ids = list(
+            set(existing_group._get_relationship_many(name="members").peer_ids) - set(members)
+        )
 
         if not self.delete_unused_nodes:
             return
@@ -267,7 +269,9 @@ def update_group(self) -> None:
             return
 
         # Calculate how many nodes should be deleted
-        self.unused_member_ids = list(set(existing_group.members.peer_ids) - set(members))  # type: ignore[union-attr]
+        self.unused_member_ids = list(
+            set(existing_group._get_relationship_many(name="members").peer_ids) - set(members)
+        )
 
         if not self.delete_unused_nodes:
             return