Filbrick Pines

Filbrick Pines is the father of Stanley and Stanford Pines and great grandfather of Dipper and Mabel Pines.

History
Growing tired of his son's weak nature, Filbrick forced a young Stanley Pines into boxing lessons, hoping it would build a stronger character. Though Stanley believed it was done simply because his father disliked him, he later grew to appreciate the lasting benefits, later repeating the same process with his great-nephew, Dipper Pines.

It is possible that he also had Stanford, his other son, take boxing lessons, as Stanford was seen in the background of his lesson wearing boxing gloves and a boxing helmet.

When Stanley accidentally damaged Stanford's perpetual motion machine, ruining his twin's chances of getting into his dream college, Filbrick believed he had done on purpose, and angrily disowned Stanley for ruining the family's chances of being rich. He threw Stanley out of the house, telling him he could only come back when he'd earned the kind of fortune he'd cost them.

Personality
From what little we hear of him from Stan, it's implied that he was tough, but fair; only pushing Stan so he would be the best he could be. He also seems to be a man of few words, as in all his time onscreen, his only reaction to his surroundings is a simple nod of the head.

It's revealed in "A Tale of Two Stans" that he's very honest, and generally unimpressed with everything, the exception being when Stanford Pines was qualified for West Coast Tech.

Appearance
Stan's father is a robust looking man; he has burly arms, skinny legs, and a distinct cleft chin. Just to the left of his chin is what appears to be a birthmark. He has light brown hair, and a small mustache. He wears a fedora, shades, and a dark yellow, plaid suit with lighter yellow lines. Underneath the suit, he wears a blue dress shirt and white tie, along with brown dress pants and black shoes.