How to display child categories of current category’s parent category?

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I now realize there’s an easier way to do this:

<?php   if (is_category( )) {

        $thiscat = get_category( get_query_var( 'cat' ) );
        $catid = $thiscat->cat_ID;
        $parent = $thiscat->category_parent;

        if (!empty ($parent) ) {
        //child category pages

        $catlist = get_categories(
        array(
        'child_of' => $parent,
        'orderby' => 'id',
        'order' => 'DESC',
        'exclude' => $catid,
        'hide_empty' => '0'
        ) );
}
} ?>

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