Including style.css in Child Theme

get_stylesheet_uri will return the current theme’s stylesheet– the child stylesheet if it is a child theme. While not entirely clear from the Codex entry for that function, it is clear from the entry for get_stylesheet_directory_uri, which is used by get_stylesheet_uri. What should be happening is that the child stylesheet is being enqueued twice under different slugs.

To get the parent stylesheet you need to enqueue the parent sheet with get_template_directory_uri, which always returns the parent.