Oh, Okay - now I understand. Sorry.
For Family Class applications (other than Spouse/Common-law partners and dependent children aps) the visa office sends forms to the applicants requesting that they schedule and complete a medical examination. The
Region Specific forms for your area will be more specific about the medical examination procedures. But I can't really tell, from looking at what you've said is written in CAIPS, whether CHC-Islamabad has sent a medical request to your family members yet or not. Hopefully someone with more experience than I have with family member immigrations will have more insight.
You indicated in
your other thread that your application has been at CHC-Islamabad since August 2007. The
processing timeline for Islamabad shows that applications for parents (and their dependent children) takes from 10-38 months . . . with the majority being finalized within about 18 months. However, you said something in your other thread about there having been some issues regarding your brothers and proof that they were still full-time students - so that would have delayed processing somewhat.
As long as Islamabad has the proper address for your family members, I wouldn't worry about them not having received their medical requests yet . . . it looks as though it takes quite some time.