I'm fortunate enough to not have dealt with that yet. My condolences to his family, and you.
The worst wake I ever had to do was for my friend's little brother. I wasn't close to the brother, but you can't help but weep when you walk up to an open coffin with a 6 year old boy in it. My understanding is the family still doesn't actually know what happened, he just died in his sleep. Such a shame.