Update main_statements.md

Author: flexferrum

docs/usage/main_statements.md

@@ -68,14 +68,21 @@ I.e. left part of this expression (before 'if') is a true-branch of the statemen
 
 {% assign children_list = site.pages | sort:"nav_order" %}
 {% for child in children_list %}
-  {% if child == page.parent %}
+  {% if child.title == page.parent.title %}
     {% assign parent_page_info = child %}
     parent.nav_order (0) = {{ child.nav_order }}<br/>
     parent.url (0) = {{ child.url }}<br/>
     parent.title (0) = {{ child.title }}<br/>
     parent.nav_order (1) = {{ parent_page_info.nav_order }}<br/>
     parent.url (1) = {{ parent_page_info.url }}<br/>
     parent.title (1) = {{ parent_page_info.title }}<br/>
+  {% else %}
+    parent.nav_order (2) = {{ page.parent.nav_order }}<br/>
+    parent.url (2) = {{ page.parent.url }}<br/>
+    parent.title (2) = {{ page.parent.title }}<br/>
+    parent.nav_order (3) = {{ child.parent.nav_order }}<br/>
+    parent.url (3) = {{ child.parent.url }}<br/>
+    parent.title (3) = {{ child.parent.title }}<br/>
   {% assign parent_page_info = child %}
   {% endif %}
   {% if child.parent == page.parent and  child.title == page.title %}