On the U.S. TV series "Lassie" (1954-1971), which of the following characters was the first boy to serve as Lassie's owner?

With the TV series "Lassie", the show's first 10 seasons follow Lassie's adventures in a small farming community. Fictional eleven-year-old Jeff Miller, his mother, and his grandfather are Lassie's first human companions. Seven-year-old Timmy Martin and his adoptive parents take over in the fourth season. When Lassie's exploits on the farm end with the eleventh season, she finds new adventures in the wilderness alongside United States Forest Service Rangers. After traveling on her own for a year, Lassie finally settles at a children's home for her final two syndicated seasons.

Portrayed by child actor Tommy Rettig, Jeff makes his first appearance in the series premiere, "The Inheritance" (1954), and his last appearance in the mid-fourth season episode, "Transition" (1957). The series won its only Emmy Awards during the time that Jeff was on the show.