Degrassi Junior High (1987)

Season 3: Episode 13

Arthur doesn't like his father's new girlfriend, and him and Yick plot to break them up. Arthur is frustrated when his attempts don't work, and is shocked to see that his father's girlfriend had spent the night. At the school open house, Arthur is furious when his father brings his girlfriend. Arthur feels bad when his father later tells him that he broke up with her.