On this fateful day , my loving father left us for his heavenly abode.What should i do for his peace.?

My father left us on 18/11/2008 for his heavenly abode. He was one of the nicest persons who always cared for others and never hurt any one. I wish that he should be in peace and happiness. Incidently my mother expired on 27/09/2008 and my father on 18/11/2008.