diff --git a/core/filters.py b/core/filters.py
index f2a1084c..6c3ca07e 100644
--- a/core/filters.py
+++ b/core/filters.py
@@ -180,7 +180,7 @@ class ProductFilter(FilterSet):
             return queryset
 
         include = self.data.get("include_subcategories")
-        include_children = str(include).lower() in ("1", "true", "t", "yes")
+        include_children = str(include).lower() in ("1", "true", "t", "yes", "y")
 
         try:
             root = Category.objects.get(uuid=value)
@@ -188,7 +188,7 @@ class ProductFilter(FilterSet):
             return queryset.none()
 
         if include_children:
-            descendants = root.get_descendants(include_self=True)
+            descendants = root.get_ancestors(include_self=True)
             return queryset.filter(category__in=descendants)
         else:
             return queryset.filter(category__uuid=value)