Any advice on helping a friend through the death of a parent?

A male friend's father is on his deathbed and is being made comfortable awaiting the inevitable. They have had a rocky relationship and my friend put his dad through much grief growing up. They have made amends.I've never helped a friend face the death of a parent before. Any advice from someone who has been through something similar?

Just be there. Help them keep their mind about it. Take him to the movies or take him bowling. Anything to keep him from stewing.