diff --git a/homeassistant/components/freebox/__init__.py b/homeassistant/components/freebox/__init__.py
index b3163741cdc9..6c5a66e284f4 100644
--- a/homeassistant/components/freebox/__init__.py
+++ b/homeassistant/components/freebox/__init__.py
@@ -8,7 +8,7 @@ from freebox_api.exceptions import HttpRequestError
 from homeassistant.const import CONF_HOST, CONF_PORT, EVENT_HOMEASSISTANT_STOP, Platform
 from homeassistant.core import Event, HomeAssistant
 from homeassistant.exceptions import ConfigEntryNotReady
-from homeassistant.helpers import entity_registry as er
+from homeassistant.helpers import device_registry as dr, entity_registry as er
 from homeassistant.helpers.event import async_track_time_interval
 
 from .const import DOMAIN, PLATFORMS
@@ -96,6 +96,12 @@ async def async_setup_entry(hass: HomeAssistant, entry: FreeboxConfigEntry) -> b
 
     entry.runtime_data = router
 
+    # Register the router device up front so child devices (home devices, disks)
+    # can deterministically resolve it as their via_device on any platform.
+    dr.async_get(hass).async_get_or_create(
+        config_entry_id=entry.entry_id, **router.device_info
+    )
+
     await hass.config_entries.async_forward_entry_setups(entry, PLATFORMS)
 
     async def async_close_connection(event: Event) -> None:
diff --git a/homeassistant/components/freebox/entity.py b/homeassistant/components/freebox/entity.py
index 6b2b32a61b41..ddc694014e9e 100644
--- a/homeassistant/components/freebox/entity.py
+++ b/homeassistant/components/freebox/entity.py
@@ -54,7 +54,11 @@ class FreeboxHomeEntity(Entity):
             model=self._model,
             name=node["label"].strip(),
             sw_version=self._firmware,
-            via_device=(DOMAIN, router.mac),
+            via_device_id=dr.async_get_device_id_by_identifier(
+                router.hass,
+                (DOMAIN, router.mac),
+                config_entry_id=router.config_entry.entry_id,
+            ),
         )
 
     async def async_update_signal(self) -> None:
diff --git a/homeassistant/components/freebox/router.py b/homeassistant/components/freebox/router.py
index dc88284824fd..dfc1bfa58331 100644
--- a/homeassistant/components/freebox/router.py
+++ b/homeassistant/components/freebox/router.py
@@ -108,6 +108,7 @@ class FreeboxRouter:
     ) -> None:
         """Initialize a Freebox router."""
         self.hass = hass
+        self.config_entry = entry
         self._host = entry.data[CONF_HOST]
         self._port = entry.data[CONF_PORT]
 
diff --git a/homeassistant/components/freebox/sensor.py b/homeassistant/components/freebox/sensor.py
index dfaa036a1b09..6f28dbbbb540 100644
--- a/homeassistant/components/freebox/sensor.py
+++ b/homeassistant/components/freebox/sensor.py
@@ -17,6 +17,7 @@ from homeassistant.const import (
     UnitOfTemperature,
 )
 from homeassistant.core import HomeAssistant, callback
+from homeassistant.helpers import device_registry as dr
 from homeassistant.helpers.device_registry import DeviceInfo
 from homeassistant.helpers.dispatcher import async_dispatcher_connect
 from homeassistant.helpers.entity_platform import AddConfigEntryEntitiesCallback
@@ -246,9 +247,10 @@ class FreeboxDiskSensor(FreeboxSensor):
             model=disk["model"],
             name=f"Disk {disk['id']}",
             sw_version=disk["firmware"],
-            via_device=(
-                DOMAIN,
-                router.mac,
+            via_device_id=dr.async_get_device_id_by_identifier(
+                router.hass,
+                (DOMAIN, router.mac),
+                config_entry_id=router.config_entry.entry_id,
             ),
         )
 
diff --git a/tests/components/freebox/test_init.py b/tests/components/freebox/test_init.py
index f1ef3e6f308d..60d5cf1f1b43 100644
--- a/tests/components/freebox/test_init.py
+++ b/tests/components/freebox/test_init.py
@@ -169,6 +169,27 @@ async def test_unique_id_migration(
     )
 
 
+@pytest.mark.usefixtures("router")
+async def test_home_device_via_device(
+    hass: HomeAssistant,
+    device_registry: dr.DeviceRegistry,
+) -> None:
+    """Test home devices are linked to the router device via via_device_id."""
+    entry = await setup_platform(hass, BINARY_SENSOR_DOMAIN)
+
+    router_device = device_registry.async_get_device_by_identifier(
+        (DOMAIN, MOCK_MAC), entry.entry_id
+    )
+    assert router_device is not None
+
+    pir_node_id = 26  # Détecteur from fixture
+    pir_device = device_registry.async_get_device_by_identifier(
+        (DOMAIN, pir_node_id), entry.entry_id
+    )
+    assert pir_device is not None
+    assert pir_device.via_device_id == router_device.id
+
+
 async def test_home_device_label_sync(
     hass: HomeAssistant,
     device_registry: dr.DeviceRegistry,