diff --git a/moto/iot/models.py b/moto/iot/models.py
index 9e520b0fd..b7a613cc3 100644
--- a/moto/iot/models.py
+++ b/moto/iot/models.py
@@ -55,7 +55,7 @@ class FakeThingType(BaseModel):
         self.thing_type_properties = thing_type_properties
         self.thing_type_id = str(uuid.uuid4())  # I don't know the rule of id
         t = time.time()
-        self.metadata = {"deprecated": False, "creationData": int(t * 1000) / 1000.0}
+        self.metadata = {"deprecated": False, "creationDate": int(t * 1000) / 1000.0}
         self.arn = "arn:aws:iot:%s:1:thingtype/%s" % (self.region_name, thing_type_name)
 
     def to_dict(self):
@@ -69,7 +69,7 @@ class FakeThingType(BaseModel):
 
 class FakeThingGroup(BaseModel):
     def __init__(
-        self, thing_group_name, parent_group_name, thing_group_properties, region_name
+        self, thing_group_name, parent_group_name, thing_group_properties, region_name, thing_groups
     ):
         self.region_name = region_name
         self.thing_group_name = thing_group_name
@@ -78,7 +78,13 @@ class FakeThingGroup(BaseModel):
         self.parent_group_name = parent_group_name
         self.thing_group_properties = thing_group_properties or {}
         t = time.time()
-        self.metadata = {"creationData": int(t * 1000) / 1000.0}
+        self.metadata = {"creationDate": int(t * 1000) / 1000.0}
+        if parent_group_name:
+            self.metadata["parentGroupName"] = parent_group_name
+            self.metadata["rootToParentThingGroups"] = [
+                {"groupName": g.thing_group_name, "groupArn": g.arn}
+                for g in thing_groups
+            ]
         self.arn = "arn:aws:iot:%s:1:thinggroup/%s" % (
             self.region_name,
             thing_group_name,
@@ -639,6 +645,7 @@ class IoTBackend(BaseBackend):
             parent_group_name,
             thing_group_properties,
             self.region_name,
+            self.thing_groups
         )
         self.thing_groups[thing_group.arn] = thing_group
         return thing_group.thing_group_name, thing_group.arn, thing_group.thing_group_id