Miroku's father

 was the son of Miyatsu and father of Miroku, the second monk in Miroku's line to inherit both a lecherous personality and the curse of the Kazaana from his father. Little is known about him. When Miroku was still a young boy, he witnessed his father being killed after being sucked into his own wind tunnel, leaving him in the care of his late father's close friend, the lecherous monk Mushin. In an illusion cast by Naraku during the final battle, Sango and Miroku were taken back to this same moment in Miroku's childhood to witness the death of his father. This event planted the fear in Sango that her love, Miroku, would suffer the same violent fate.

Trivia

 * In the manga and anime, Miroku often referred him as, an informal and rude way to describe him, rather using the formal wording that is used by most Japanese people.

Mirokus Vater 弥勒之父