AFC - Advance Repeater

<?php

// parent loop
if( have_rows('parent_repeater') ):

    while( have_rows('parent_repeater') ) : the_row();

        ?>

        <div class="row">

            <h3><?php the_sub_field('parent_title'); ?></h3>

            <?php

            // child loop
            if( have_rows('child_repeater') ): ?>

                <ul>

                <?php while( have_rows('child_repeater') ) : the_row(); ?>

                    <li><b><?php the_sub_field('child_title'); ?></b> <?php the_sub_field('child_value'); ?></li>

                <?php endwhile; ?>

                </ul>

            <?php endif;
            // end child loop

            ?>

        </div>

        <?php

    endwhile;

endif;
// end parent loop

?>