Huh, what do they do if you just say "Alright, guess he's your problem now"? Pretty sure my parents would be cheering me on from the after life. We're not the most sentimental bunch.
Edit: got curious. I guess it's just white/pale ash?
The defining aspect of the argument being whether you can tell the ashes came from a human, or whether you'd rather not know, or care to think about it.