<div class="wrapper">
    <div class="paDiv">
       <div class="saDivOne">
       </div>
    </div>
    <div class="paDivTwo">
       <div class="saDivTwo">
       </div>
    </div>
</div>


<script>
$('.paDiv').each(function(){
    htmlContent = $(this).children().html();
    SisterDivContent = $(this).next('.paDivTwo').children().html();
    console.log(SisterDivContent);
})
</script>