I agree it's a good laugh. Too bad it's been rendered obsolete due to events in the manga. Ranma has been back to his home before, in vol. 28, and he had no other siblings. Also, the Saotome family has been reunited, but their household has been demolished. But then no one could have known all that would happen a year and a half ago. 
Now that the secret is out, I would really like to see Ranma fics involving Nodoka playing an active part (not including that Martial Arts lemon one....) and not just appearing. Come on, any takers?