When friends, family, and just plain good folks that we are touched by, are taken 'before their time', we should honor their memories and our time with them by living our own lives as best as we are capable.
I have run across folks who lost friends in war and 30 years later they are remembering their buds by wasting away their own lives through abusive behavior. I have NEVER 'memorialized' my lost buddies by staying drunk or stoned outa my gourd. I HONORED their memory by being the BEST person I could be.
Juice, put together a little packet of 'memories' of your friend, contact his son and tell him just how GOOD of people his ma and pa were and still are in your memory. He probably could use a high quality male figure/friend and you'd be VERY good at that.