Life imprisonment remedy after losing in High Court

Hello, i am 28 from gujarat, my query about section IPC 302. In june 2006 my father and my 3 uncle about the farm land issues excedentali do murder of 1 person who's beside the farm. He want to take our farm land and local police not help to us for political problem. After doing this murder self arrest to nearest police by my father. and after that file case in distric court. running 4 year this case and in last we fail to win this case, and get life time prison. after that we try to file this case in gujarat high court and its also take 3 year given the dision. but same also we fail to win this case and get same punish life time prison. currently they in prisoner in Rajkot and free when his parol, and farlo and in time to time they get back to prision. Now my question is how many year punish in life time prison? and second question is what to do next step to try again with this case? Its already 11 year complete in prison.