Conditional Function To Enqueue Stylesheet

I have a parent theme and a child theme, both with their own style.css file.

My functions.php file has the following:

function theme_styles() {
	wp_enqueue_style( 'parent_bootstrap_css', get_template_directory_uri() . '/css/bootstrap.css' );
	wp_enqueue_style( 'parent_style_css', get_template_directory_uri() . '/style.css' );
}
add_action( 'wp_enqueue_scripts', 'theme_styles' );

When using my child theme, I would like to modify the function to conditionally enqueue the child’s style.css when template_directory and stylesheet_directory are not the same.
Any help appreciated. Thanks!!!