Jade and Casper Wikia

Melissa "Missy" English (nee McFadden) is the wife of Mr. English,

older sister of Roger McFadden, aunt of Stretch, Stinky, Fatso, Marie and JT McFadden,  and great-aunt of Casper, Jade, and Venus McFadden, and Spooky Ashwood and first-born daughter of Roger and Eleanor McFadden.

She is mentioned in the Jade and Casper short, "Family Tree" with countless other members of the story while Jade is researching her family members for a class in school. Missy is also said to be like her great-niece, Jade and her sister, Venus.