Hilda's great-granddad

Hilda's great-grandad is an unseen character who's only been mentioned in Chapter 1: The Hidden People. He is Hilda's great-grandfather.

Biography
Little is known about Hilda's great-grandad's life, expect that, in the animated series at least, he build the old cabin long ago. However, unbeknownst to hims, he choose a place inhabited by Elves, who he couldn't see.

Trivia

 * It is unknown if whether he's Hilda's maternal or paternal great-granddad.
 * In the graphic novels, it was Hilda's grandfather instead who build the cabin.