How to Fetch data from while loop inside a while loop

I have this code and thing it's a weird but when I get the last_name from the first query which is a unique number and with the help of that I get the Spell of the last name from another table but when I try to get another data just below the second which ends it thinks that the first while loop has ended and then I can't get the rest of the data from the first while loop and I even tried this code but unfortunately it didn't worked for me

<div class="row">
    <?php 
    $sql2 = "SELECT id,last_name,age,height,weight,gender,education,work
             from profile where parent_key!='$parent_key' ";
    $retval2 = mysqli_query($con,$sql2);

    if(! $retval2 ) {
        die('Could not get data: ' . mysql_error());
    }

    while($row = mysqli_fetch_array($retval2, MYSQL_ASSOC)) {
    ?>

    <div class="row">
        <div class="col-lg-6 col-md-6 col-sm-6">
            <span>Unique Id</span>
            <h3><?php  echo $row['id'] ?></h3>
        </div>
    <div class="col-lg-6 col-md-6 col-sm-6">
        <span>Surname</span>
        <h3><?php $surname = $row['last_name']; 
            $sql3 = "SELECT last_name from surname where id='$surname'";
            $retval3 = mysqli_query($con,$sql3);
            if(! $retval3 ) {
                die('Could not get data: ' . mysql_error());
            }
            while($row = mysqli_fetch_array($retval3, MYSQL_ASSOC)) {
                echo $new_last_name ="{$row['last_name']}";
            ?>
            ?>
        </h3>
    </div>

</div>
<!-- /.row -->


<!-- /.row -->

<?php
    }
?>

<?php
    }
?>
</div>
<!-- /.row -->

And Thanks for helping in advance.