How to sort Node which are child using Attribute in xml

I have xml like

<?xml version="1.0" encoding="UTF-8"?>
<insiders>
   <insider>
      <owner id="101912">
         <namestrings>
            <namestring />
         </namestrings>
      </owner>
      <positionHistory>
         <position code="122">
            <from />
         </position>
      </positionHistory>
      <linkages>
         <linkage>
            <owner id="112025">
               <namestrings>
                  <namestring />
               </namestrings>
            </owner>
            <relationshipHistory>
               <relationship code="201" />
            </relationshipHistory>
         </linkage>
      </linkages>
   </insider>
   <insider>
      <owner id="100366">
         <namestrings>
            <namestring>KAITUE KARRI</namestring>
         </namestrings>
      </owner>
      <positionHistory>
         <position code="102">
            <from>2013-08-07</from>
         </position>
      </positionHistory>
      <linkages>
         <linkage>
            <owner id="100354">
               <namestrings>
                  <namestring>KAITUE RAIMO KUOLINPESÄ</namestring>
               </namestrings>
            </owner>
            <relationshipHistory>
               <relationship code="302">
                  <from>1998-10-23</from>
               </relationship>
            </relationshipHistory>
         </linkage>
         <linkage>
            <owner id="126799">
               <namestrings>
                  <namestring />
               </namestrings>
            </owner>
            <relationshipHistory>
               <relationship code="204">
                  <from>2014-09-09</from>
               </relationship>
               <relationship code="201">
                  <to>2014-09-08</to>
               </relationship>
            </relationshipHistory>
         </linkage>
      </linkages>
   </insider>
</insiders>

I want to sort Code which is in relationship node I have tried below menioned code but it's give me only relationship nodes How can I sort that relationship node with full xml

 var Document = doc.Descendants("relationship")
                   .OrderBy(p =>(int) p.Attribute("code"));