diff --git a/reasoning_gym/graphs/family_relationships.py b/reasoning_gym/graphs/family_relationships.py
index 81e81583..9c686771 100644
--- a/reasoning_gym/graphs/family_relationships.py
+++ b/reasoning_gym/graphs/family_relationships.py
@@ -233,18 +233,29 @@ class FamilyRelationshipsDataset(ProceduralDataset):
         # Create ID counter
         id_counter = count()
 
-        # Create grandparents generation
-        grandfather = Person(get_name(Gender.MALE), Gender.MALE, next(id_counter))
-        grandmother = Person(get_name(Gender.FEMALE), Gender.FEMALE, next(id_counter))
-        grandfather.add_spouse(grandmother)
-        family.update([grandfather, grandmother])
+        # Create paternal grandparents generation
+        grandfather_of_father = Person(get_name(Gender.MALE), Gender.MALE, next(id_counter))
+        grandmother_of_father = Person(get_name(Gender.FEMALE), Gender.FEMALE, next(id_counter))
+        grandfather_of_father.add_spouse(grandmother_of_father)
+        family.update([grandfather_of_father, grandmother_of_father])
+
+        # Create maternal grandparents generation
+        grandfather_of_mother = Person(get_name(Gender.MALE), Gender.MALE, next(id_counter))
+        grandmother_of_mother = Person(get_name(Gender.FEMALE), Gender.FEMALE, next(id_counter))
+        grandfather_of_mother.add_spouse(grandmother_of_mother)
+        family.update([grandfather_of_mother, grandmother_of_mother])
 
         # Create parents
         father = Person(get_name(Gender.MALE), Gender.MALE, next(id_counter))
         mother = Person(get_name(Gender.FEMALE), Gender.FEMALE, next(id_counter))
         father.add_spouse(mother)
-        grandfather.add_child(father)
-        grandmother.add_child(father)
+        
+        # Link parents to their respective parents
+        grandfather_of_father.add_child(father)
+        grandmother_of_father.add_child(father)
+        grandfather_of_mother.add_child(mother)
+        grandmother_of_mother.add_child(mother)
+        
         family.update([father, mother])
 
         # Add children