diff --git a/sect/core/trapezoidal/y_node.py b/sect/core/trapezoidal/y_node.py
index 6a9d60f..1ce2799 100644
--- a/sect/core/trapezoidal/y_node.py
+++ b/sect/core/trapezoidal/y_node.py
@@ -9,15 +9,13 @@
 
 
 class YNode(Node):
-    __slots__ = 'edge', 'above', 'below'
+    __slots__ = 'above', 'below', 'edge'
 
     def __init__(self, edge: Edge, below: Node, above: Node) -> None:
         super().__init__()
-        self.edge = edge
-        self.below = below
-        self.above = above
-        self.below._add_parent(self)
+        self.above, self.below, self.edge = above, below, edge
         self.above._add_parent(self)
+        self.below._add_parent(self)
 
     __repr__ = generate_repr(__init__)