Dear sergio,

I think you are right, and have confirmed your setting.

The following has the same effect, just for your information.

(define-key org-mode-map (kbd "C-c C-r")
  '(lambda () (interactive) (org-show-siblings)))


Best regards,
Takaaki Ishikawa

> (add-hook 'org-mode-hook (lambda ()
> 	(local-set-key "\C-c\C-r" (lambda ()
> 				    (interactive)
> 				    (org-show-siblings)))))