Category-{child_category_slug}.php

<?php get_header(); ?>
    <?php if( is_home() && ! is_paged() ) : ?>
        <?php if( pinboard_get_option( 'slider' ) ) : ?>
            <?php get_template_part( 'slider' ); ?>
        <?php endif; ?>
        <?php get_sidebar( 'wide' ); ?>
        <?php get_sidebar( 'boxes' ); ?>
    <?php elseif( ( is_home() && is_paged() ) || ( ! is_home() && pinboard_get_option( 'location' ) ) ) : ?>
        <?php pinboard_current_location(); ?>
    <?php endif; ?>
    <div id="container">
        <section id="content" <?php pinboard_content_class(); ?>>
            <?php if( is_category( pinboard_get_option( 'portfolio_cat' ) ) || ( is_category() && cat_is_ancestor_of( pinboard_get_option( 'portfolio_cat' ), get_queried_object() ) ) ) : ?>
                <?php pinboard_category_filter( pinboard_get_option( 'portfolio_cat' ) ); ?>
            <?php endif; ?>
            <?php if( have_posts() ) : ?>
                <div class="entries">
                    <?php while( have_posts() ) : the_post(); ?>
                        <?php get_template_part( 'content-child', get_post_format() ); ?>
                    <?php endwhile; ?>
                </div><!-- .entries -->
                <?php pinboard_posts_nav(); ?>
            <?php else : ?>
                <?php pinboard_404(); ?>
            <?php endif; ?>
        </section><!-- #content -->
        <?php if( 'no-sidebars' != pinboard_get_option( 'layout' ) && 'full-width' != pinboard_get_option( 'layout' ) && ! is_category( pinboard_get_option( 'portfolio_cat' ) ) && ! ( is_category() && cat_is_ancestor_of( pinboard_get_option( 'portfolio_cat' ), get_queried_object() ) ) ) : ?>
            <?php get_sidebar(); ?>
        <?php endif; ?>
        <div class="clear"></div>
    </div><!-- #container -->
<?php get_footer(); ?>