system
Given the following post, respond as if you're commenting on Reddit:
human
[Harry Potter] Can a ghost become a Secret Keeper?

Pardon me for not giving specifics--this is obviously a delicate matter I am bringing to you.

In the course of my life time I have amassed quite a few Galleons. Rather *a lot* of them, to be perfectly blunt and honest. My grown son and daughter, however, are selfish, irresponsible piles of dragon dung who are waiting my demise like vultures over a sick re'em, waiting for an inheritance they'll squander within the week.

My dear departed grandfather, still on this Earth, has volunteered to be the subject of a Fidelius Charm to hide the location of the money, to be diverged only when he judges that my children, grandchildren, or distant descendants are worthy of their inheritance.

I am eager to perform the charm, but I must ask: is this even possible? Does my dear, semi-departed grandfather possess enough of a present soul for the concealment of the secret? Could this have any adverse side effects?

I am getting on in my years and would rather my Galleons go to a worthy heir, no matter how many centuries have to pass. Please help, and I'll have my elf clean your attic or send a few Sickles your way.
gpt
>“How does that work?” said Madam Rosmerta, breathless with interest. Professor Flitwick cleared his throat. 

> “An immensely complex spell,” he said squeakily, “involving the **magical concealment of a secret inside a single, living soul**. The information is hidden inside the chosen person, or Secret-Keeper, and is henceforth impossible to find — unless, of course, the Secret-Keeper chooses to divulge it. As long as the Secret-Keeper refused to speak, You-Know-Who could search the village where Lily and James were staying for years and never find them, not even if he had his nose pressed against their sitting room window!” 

—*Harry Potter and the Prisoner of Azakaban*, Chapter 10 — "The Marauder's Map"

Emphasis on living.