Burying
      kaafirs
Question

                What
      is the ruling concerning a man who becomes Muslim and his father is a
      kaafir and a mushrik who worships idols until he dies as a Mushrik? Is it
      permissible for his Muslim son to take part in washing and burying him? If
      he takes part in the washing and the burial, and the customs of the
      kuffaar, what is the Islamic ruling on him? What should the Muslim son do
      after doing these things?
Praise be to Allah.The
      basic principle concerning the kaafir when he dies is that his relatives
      should bury him in a grave so that he (the body) will not harm or disturb
      other people. He should not be washed or shrouded, and no prayer should be
      offered over him. Whoever does anything other than that or takes part with
      the kuffaar in their customs has to repent and seek the forgiveness of
      Allaah, and hope that Allaah will accept his repentance.
 And
      Allaah is the Source of strength. May Allaah bless our Prophet Muhammad
      and his family and companions, and grant them peace.