diff --git a/src/keycloak/keycloak_admin.py b/src/keycloak/keycloak_admin.py
index 87ad78f..eddaed9 100644
--- a/src/keycloak/keycloak_admin.py
+++ b/src/keycloak/keycloak_admin.py
@@ -1307,6 +1307,28 @@ class KeycloakAdmin:
         data_raw = self.connection.raw_get(urls_patterns.URL_ADMIN_GROUP.format(**params_path))
         return raise_error_from_response(data_raw, KeycloakGetError)
 
+    def get_child_groups(self, group_id, query=None):
+        """Get child groups by parent id.
+
+        Returns a list of groups who are children of group with id
+
+        GroupRepresentation
+        https://www.keycloak.org/docs-api/18.0/rest-api/#_grouprepresentation
+
+        :param group_id: The group id
+        :type group_id: str
+        :return: Keycloak server response (GroupRepresentation)
+        :rtype: list
+        """
+        query = query or {}
+        params_path = {"realm-name": self.connection.realm_name, "id": group_id}
+        url = urls_patterns.URL_ADMIN_GROUP_CHILD.format(**params_path)
+
+        if "first" in query or "max" in query:
+            return self.__fetch_paginated(url, query)
+
+        return self.__fetch_all(url, query)
+
     def get_subgroups(self, group, path):
         """Get subgroups.
 
diff --git a/tests/test_keycloak_admin.py b/tests/test_keycloak_admin.py
index c5aa6ff..a91c0a9 100644
--- a/tests/test_keycloak_admin.py
+++ b/tests/test_keycloak_admin.py
@@ -660,15 +660,21 @@ def test_groups(admin: KeycloakAdmin, user: str):
     # Test get groups again
     groups = admin.get_groups()
     assert len(groups) == 1, groups
-    assert len(groups[0]["subGroups"]) == 2, groups["subGroups"]
+    assert groups[0]["subGroupCount"] == 2, groups["subGroupCount"]
     assert groups[0]["id"] == group_id
-    assert {x["id"] for x in groups[0]["subGroups"]} == {subgroup_id_1, subgroup_id_2}
+    sub_groups = admin.get_child_groups(groups[0]["id"])
+    assert {x["id"] for x in sub_groups} == {subgroup_id_1, subgroup_id_2}
 
     # Test get groups query
     groups = admin.get_groups(query={"max": 10})
     assert len(groups) == 1, groups
+    assert groups[0]["subGroupCount"] == 2, groups["subGroupCount"]
+
+    # Test get all groups query
+    groups = admin.get_groups(query={"q": "%"})
+    assert len(groups) == 1, groups
+    assert groups[0]["subGroupCount"] == 2, groups["subGroupCount"]
     assert len(groups[0]["subGroups"]) == 2, groups["subGroups"]
-    assert groups[0]["id"] == group_id
     assert {x["id"] for x in groups[0]["subGroups"]} == {subgroup_id_1, subgroup_id_2}
 
     # Test get group