Replacing CSS in Child Theme

Hi
The Bootstrap uses two CSS files (css/bootstrap[min].css & style.css) I wanted to change both so I used this code in the functions.php in the child theme (Thermory):

function remove_thematic_actions() {
    remove_action( 'init', 'the_bootstrap_register_scripts_styles' );
}
add_action('init','remove_thematic_actions');

function thermory_register_scripts_styles() {
	if ( ! is_admin() ) {
		$theme_version = _the_bootstrap_version();
		$suffix = ( defined('SCRIPT_DEBUG') AND SCRIPT_DEBUG ) ? '' : '.min';

		/**
		 * Scripts
		 */
		wp_register_script(
			'tw-bootstrap',
			get_template_directory_uri() . "/js/bootstrap{$suffix}.js",
			array('jquery'),
			'2.0.3',
			true
		);

		wp_register_script(
			'the-bootstrap',
			get_template_directory_uri() . "/js/the-bootstrap{$suffix}.js",
			array('tw-bootstrap'),
			$theme_version,
			true
		);

		/**
		 * Styles
		 */
		wp_register_style(
			'tw-bootstrap',
			get_stylesheet_directory_uri() . "/css/bootstrap.css",
			array(),
			'2.0.3'
		);

		wp_register_style(
			'the-bootstrap',
			get_stylesheet_directory_uri() . "/style.css",
			array('tw-bootstrap'),
			$theme_version
		);
	}
}
add_action( 'init', 'thermory_register_scripts_styles' );

which (when I view page source) has created links to the new css in my child theme, however the css is still linking back to The Bootstrap parent theme despite the fact that: a) there is no link to it b) even when I delete the original code from the parent functions.php file it still links. The only way to stop it is by renaming the parent’s theme css file (bootstrap.min.css) then it links to the child theme css. I’d rather find out what I’m doing wrong than use this stop gap solution.
Thanks