Question on selecting siblings using ~

Question on selecting siblings using ~

Hi all,
I have this html
<div id=reportContainer>
<div id=oRepotDiv> </div>
<div> </div>
<div> </div>
<div> </div>
<div> </div>
</div>
but when I do $("#reportContainer #oRepotDiv~div"). It doesn't select anything. But $("#reportContainer #oRepotDiv") work perfectly fine. Can somebody tell me why?