Thaddeus Thatch

Thaddeus Thatch is a posthumous character appearing in Atlantis: The Lost Empire. He was the late paternal grandfather of Milo Thatch.

Personality
Thaddeus is mentioned by Milo that he acted more like a father to him after his parents death. He and Milo would often go out camping and tell stories about the lost continent Atlantis.

He is also very stubborn as he kept tempting Whitmore with finding the Shepherd's Journal.

Though in his final year, he died heartbroken after years of being the laughing stock by the board members at the museum.

Atlantis: The Lost Empire
It is know that Thaddeus has been friend with Whitmore for a long time and when Whitmore got fed up about Atlantis existing, they enter into a bet where if Thaddeus finds the Shepherd's Journal, Whitmore will fund the expedition and even kiss him full on the mouth. In 1911, Whitmore funds the expedition that finds the book in Iceland and when he came back it became an embarrassment of the two. But shortly afterward, Thaddeus passes away. According to Whitmore, like Milo the board members made fun of him. But it is known that he was a friend of Joshua Sweet and told him a phrase 'when you've hit the bottom, the only place left to go is up'.

Atlantis: Milo's Return
He is briefly mentioned in the sequel.