can my brother get my father's job

You may download the Rules on 'Compassionate Appointment' of the dept. and show these to a very able counsel specializing in Labor/Service matters, for a considered opinion.

Your able counsel can appraise you.

In the meantime you may go thru various threads on similar queries in ‘Search’ option on right hand side bottom of this web page e.g;

https://www.lawyersclubindia.com/experts/Appointment-on-compassionate-ground--604946.asp

Repeated at:

https://www.lawyersclubindia.com/forum/can-my-brother-get-my-father-s-job-141376.asp