Uh, there's some guy posting a whole multi-part conspiracy theory about my family and I, what can I do about this?

I got home from a meeting to see my email with a new message between my grandfather, three uncles, and father about some guy from youtube posting multiple videos including images from their picasa accounts as some major conspiracy theory about the girl who was killed during the Gabrielle Gifford shooting still being alive. The girl he claims it is-is my younger cousin from Florida.

Additionally, he claims my grandfather is really Dallas Green..not too sure who he is off the top of my head, but apparently he's famous or something.

On another note, he's included my great-grandfather, on my other side of the family as being some top-shot global ruling guy. In reality, he's a man who made a lot of money at the horse track..the Clocker Lawton card. He's in no way shape or form some economy controlling lord.

Reddit, is there anything I can legally do? My uncle has looked into it some, actually, but I know there are a bunch of lawyers who hang out on Reddit. Besides legally, what can I do about this. I almost find it cool, in a way, that someone thinks my family controls the global economy, or are a group of double agents, and whatever.

Here's the link to a video containing pictures of me (when I was much younger, I'm 18 now), my cousins, grandparents, parents, siblings, etc. video link