Board Thread:General Discussion/@comment-4115284-20150428133857/@comment-26266927-20150615002731

Okay, actually, Grunkle Stan is Stanley Pines, and he's actual grandfather of Dipper and Mabel. Author of the journals is Stanford Pines. He's actual grunkle of Dipper and Mabel.

In the leaked episode of GF, Dipper called author "Great Uncle Ford", so that means that Author is Stanford.