Board Thread:General Discussion/@comment-5808856-20150312001702/@comment-26072045-20150709235946

Aardvarkbanana911 wrote: Dragonian King wrote:

Aardvarkbanana911 wrote: Stanford is Grunkle Stan. Stanley Pines is Grandpa Stan. The Grunkle Stan we know is Stanley, and the Author is Stanford. Stanford, the Author, is their great-uncle, and Stanley is their grandfather.

Neither are their grandfather. This was confirmed in the preview. I still hope they're keeping that a secret and it turns out not to be the case but for now they're both great uncles unless we learn otherwise.