From b3a9d9a35fc96802e8b5c04948a696aad59a1d6e Mon Sep 17 00:00:00 2001
From: Mark Rosemaker <48681726+MarkRosemaker@users.noreply.github.com>
Date: Sun, 12 Oct 2025 18:56:04 +0200
Subject: [PATCH] [Tree Building Exercise & Class Inheritance Concept] Spelling
 Fixes (#4009)

* Fix possessive 'its' spelling in documentation and tests
* Corrected 'possibly' to 'possible
* Revert "Corrected 'possibly' to 'possible"
This reverts commit 9a42041c455913d8c97f98f8e45eca3cd64219e3.
* revert: changes in reference/ folder

[no important files changed]
---
 concepts/class-inheritance/about.md                    | 2 +-
 exercises/practice/tree-building/.meta/example.py      | 2 +-
 exercises/practice/tree-building/tree_building_test.py | 6 +++---
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/concepts/class-inheritance/about.md b/concepts/class-inheritance/about.md
index 5db7909e..9f1bdf30 100644
--- a/concepts/class-inheritance/about.md
+++ b/concepts/class-inheritance/about.md
@@ -7,7 +7,7 @@ In situations where only a small amount of functionality needs to be customized
 
 `Inheritance` describes `is a kind of` relationship between two or more classes, abstracting common details into super (_base_ or _parent_) class and storing specific ones in the subclass (_derived class_ or _child class_).
 
-To create a child class, specify the parent class name inside the pair of parenthesis, followed by it's name.
+To create a child class, specify the parent class name inside the pair of parenthesis, followed by its name.
 Example
 ```python
 class Child(Parent):  
diff --git a/exercises/practice/tree-building/.meta/example.py b/exercises/practice/tree-building/.meta/example.py
index e3929ea0..7cf8a6ea 100644
--- a/exercises/practice/tree-building/.meta/example.py
+++ b/exercises/practice/tree-building/.meta/example.py
@@ -18,7 +18,7 @@ def validate_record(record):
         raise ValueError('Only root should have equal record and parent id.')
 
     if not record.equal_id() and record.parent_id >= record.record_id:
-        raise ValueError("Node parent_id should be smaller than it's record_id.")
+        raise ValueError("Node parent_id should be smaller than its record_id.")
 
 
 def BuildTree(records):
diff --git a/exercises/practice/tree-building/tree_building_test.py b/exercises/practice/tree-building/tree_building_test.py
index 426ed2b9..a405aa1a 100644
--- a/exercises/practice/tree-building/tree_building_test.py
+++ b/exercises/practice/tree-building/tree_building_test.py
@@ -111,7 +111,7 @@ class TreeBuildingTest(unittest.TestCase):
         with self.assertRaises(ValueError) as err:
             BuildTree(records)
         self.assertEqual(type(err.exception), ValueError)
-        self.assertEqual(err.exception.args[0], "Node parent_id should be smaller than it's record_id.")
+        self.assertEqual(err.exception.args[0], "Node parent_id should be smaller than its record_id.")
 
     def test_no_root_node(self):
         records = [
@@ -167,7 +167,7 @@ class TreeBuildingTest(unittest.TestCase):
         with self.assertRaises(ValueError) as err:
             BuildTree(records)
         self.assertEqual(type(err.exception), ValueError)
-        self.assertEqual(err.exception.args[0], "Node parent_id should be smaller than it's record_id.")
+        self.assertEqual(err.exception.args[0], "Node parent_id should be smaller than its record_id.")
 
     def test_higher_id_parent_of_lower_id(self):
         records = [
@@ -179,7 +179,7 @@ class TreeBuildingTest(unittest.TestCase):
         with self.assertRaises(ValueError) as err:
             BuildTree(records)
         self.assertEqual(type(err.exception), ValueError)
-        self.assertEqual(err.exception.args[0], "Node parent_id should be smaller than it's record_id.")
+        self.assertEqual(err.exception.args[0], "Node parent_id should be smaller than its record_id.")
 
     def assert_node_is_branch(self, node, node_id, children_count):
         self.assertEqual(node.node_id, node_id)