Ancestry.com. Description is below. It receives the data embedded in its database courtesy of unpaid volunteers. If I were you, I'd just recreate or create a whole new entry for your relative, and enhance it to your liking. That way, you'll have the initial control (although to be fair, I'm not sure who has editorial control of these pages on the site, nor do I know if Ancestor.com will own your entries anyways, despite you putting it in).
I don't think that they are charging now for this service, but who knows down the road later what they will do, or if you do anything heavy duty at the website, they'll charge.
The person who created your grandfather's entry doesn't own the entry posted for your grandfather. But, I don't know how you can change 'ownership' of your grandfather's page via Ancestry.com. I can't imagine why Ancestry.com would object to you enhancing or updating the entry. There may be options out there to do so. There are tabs on Find A Grave at the website, which I didn't get into (you know this already), I didn't want to get sucked into option after option (a morass) seeking payment(s) of some sort. Although the service seems nice, I could care less if someone wants to charge for tracking all of this stuff. I could (and do) go out to the grave site myself at any time I want.
Could be that the initial creator of your grandfather's page is deceased or has another email address (old one is obsolete, no good), etc.
Find a Grave is an American website that allows the public to search and add to an online database of cemetery records. It is owned by Ancestry.com. It receives and uploads digital photographs of headstones from burial sites, taken by unpaid volunteers at cemeteries. Find a Grave then posts the photo on its website.
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