Anti-Cosmo's and Anti-Wanda's extended family have not been seen in the series. However, as there is an Anti counterpart for every fairy, their family tree will mirror that of their fairy counterparts.
- Mama Anti-Cosma (Anti-Cosmo's mother)
- Anti-Schnozmo Anti-Cosma (Anti-Cosmo's brother)
- Big Daddy Anti-Fairywinkle (Anti-Wanda's father)
- Anti-Blonda (Anti-Wanda's sister)
|Grandpa Anti-Fairywinkle||Nana Anti-Cadabra||Grandpa Anti-Gonzo||Grandma Anti-Cosma|
|Anti-Big Daddy||Anti-Wanda's Mom||Papa Anti-Cosmo||Anti-Mama Cosma|
|Anti-Blonda Anti-Fairywinkle||Anti-Wanda Anti-Fairywinkle Anti-Cosma||Anti-Cosmo Anti-Cosma||Anti-Schnozmo|