Zoken Matou

間桐 臓硯
A shrewd powerful but ancient sorcerer Zoken is patriarch of the Mato family and is known to be the grandfather of Shinji and Sakura. He has amassed a large and extensive library of sorcerous knowledge yet his lessons are strict and harsh. Zoken considers Shinji to be a disgrace of a sorcerer and believes Sakura may have more potential than her brother. Source: Wikipedia