Roberta Cooper Black (March 10, 1934 - August 19, 2015; née Mayer), also known as Aunt Roberta was the youngest daughter of James C. Mayer Jr. and Janie Mayer, younger sister of Dorothy M. Green and maternal aunt of Angry Grandpa.
- Michael is terrified of mice, because when he was young Angry Grandpa would frequently tell him about the time Roberta woke up to her feet being chewed by mice.
- She married David Black in 1950. At the time of her death she had 8 children, 25 grandchildren, 25 great-grandchildren and 1 great-great-grandchild.
- PICKLEBOY'S TERRIFYING CHILDHOOD (mentioned)