This isnt true.. TMZ reported a follow-up story just hours later.

From TMZ.com:

So maybe Keith Richards isn't as hardcore as we thought he was.

Just hours after the Internet lit up with his claim that he'd snorted the ashes of his own father mixed with cocaine, his manager told MTV News that, sadly, it wasn't true. According to Jane Rose in an e-mail message, Richard's dad-ingesting comment was, "Said in jest ... Can't believe anyone took [it] seriously."

Yesterday, Richards added to his own self-medicating legend by telling NME, "The strangest thing I've tried to snort? My father. I snorted my father. He was cremated and I couldn't resist grinding him up with a little bit of blow. My dad wouldn't have cared ... It went down pretty well, and I'm still alive."