diff --git a/spond_classes/classes.py b/spond_classes/classes.py
index 4f0f170..c74f508 100644
--- a/spond_classes/classes.py
+++ b/spond_classes/classes.py
@@ -143,12 +143,8 @@ class SpondSubgroup:
 
     uid: str  # from API 'id'
     name: str  # from API 'name'
-    parent_group: None | SpondGroup = field(init=False)  # derived
     members: list[SpondMember] = field(default_factory=list)  # derived
 
-    def __post_init__(self) -> None:
-        self.parent_group = None
-
     def __str__(self) -> str:
         return f"[SpondSubgroup '{self.name}']"
 
diff --git a/tests/test_spondsubgroup.py b/tests/test_spondsubgroup.py
index 5de6ea0..e390311 100644
--- a/tests/test_spondsubgroup.py
+++ b/tests/test_spondsubgroup.py
@@ -18,14 +18,12 @@ def test_create():
     valid_attributes = [
         "uid",
         "name",
-        "parent_group",
         "members",
     ]
     assert sets_equal(public_attributes(my_ssg), valid_attributes)
 
     assert my_ssg.uid == "001"
     assert my_ssg.name == "My subgroup"
-    assert my_ssg.parent_group is None
     assert my_ssg.members == []
 
 
@@ -52,12 +50,10 @@ def test_from_dict(simplest_subgroup_dict):
     valid_attributes = [
         "uid",
         "name",
-        "parent_group",
         "members",
     ]
     assert sets_equal(public_attributes(my_ssg), valid_attributes)
 
     assert my_ssg.uid == "8CC576609CF3DCBC44469A799E76B22B"
     assert my_ssg.name == "Subgroup A1"
-    assert my_ssg.parent_group is None
     assert my_ssg.members == []