Mr. Preston is the father of Marcus Preston and husband of Mrs. Preston . He only appeared in Season 21 's episode, "Hummels & Heroin". He was seen at the beginning of the episode on his son's birthday.
Mr. Preston is almost bald, he has gray hair on the sides of his head and a few warts on his face, wide eyebrows, a slightly large nose and a double chin. He wears a dark blue sweater under a gray jacket, a black belt with a yellow buckle, dark yellow pants and gray sneakers. He looks to be in his 60s.