Grayson Dillon, Jr. is a minor character in the 1992 film School Ties. Mr. Dillon is the father of Charles "Charlie" Dillon and Grayson Dillon III.
Mr. Dillon is only shown in the scenes surrounding the "big game" between the St. Matthew's and St. Luke's football teams. David Greene is introduced to him by Charlie at a picnic shortly before the game and is invited to have dinner with the Dillons and the Wheelers at the country club thereafter. Mr. Dillon tries to console Charlie into seeing the positives of his efforts despite his brother's induction to the hall of fame the same day, without much success. Despite Charlie's claims that his family is putting undue pressure on him to match the achievements of his older brother, Grayson III, Mr. Dillon comes off as friendly and accepting of both his sons on an equal level.
It's not said what Mr. Dillon's job is, but it is implied that it is an important one, possibly an old money industrialist due to Charlie's remarks about his last name being the reason he is successful and popular. Mr. Dillon is among the St. Matt's alumni who helps fund David Greene's recruitment in order to beat St. Luke's.