title: Go to parent and count the number of childs in XSLT
body: <p>I have like</p>
  
  <pre><code>&lt;Father&gt;
  &lt;child1/&gt;
  &lt;child2/&gt;
  &lt;child3/&gt;
  &lt;child4/&gt;
  &lt;/Father&gt;
  </code></pre>
  
  <p>I am at <code>&lt;child1&gt;</code> node.(or in any other child node.) now I need to count the number of childs Father has. How to do this?</p>