[jQuery] Select first sibling

Hi
How do get to select the FIRST sibling ?
The problem with this is that it fades out all the siblings.
<dt>
    <div>
    <a href="#" onclick="$(this).parent().parent().siblings().fadeTo
(1500, 0.3);">Click here</a>
    </div>
</dt>
<dd>
</dd>
Thanks