Hi Shaja, I can say that you would need the immigration file rather than citizenship, but I"m not sure if you can specify just medical or if your dependent's file would be under yours or their own.
Try posting to the immigration forum, rather than citizenship. Also, check this blog:
http://medicallyinadmissible.com/ It is possible to successfully contest medical inadmissibility (as the author of the blog did), though the help of a good and reputable immigration lawyer would be indispensable.