Hi,

Add this code to the functions.php of the child theme:

function thegem_child_woocommerce_output_related_products() {    
remove_action('thegem_woocommerce_after_single_product', 'woocommerce_output_related_products', 5);
}
add_action('init', 'thegem_child_woocommerce_output_related_products');