The Wizarding World of Harry Potter had its fair share of controversial characters. From Dolores Umbridge to Rita Skeeter, author J.K. Rowling created loads of different characters and personalities that stood in the way of the main protagonists in Harry Potter. The Dursley family was part of the long list of controversial Harry Potter characters. Yet, fans were in for quite a surprise when the later movies introduced a Dursley family member who was even nastier than Dudley, Petunia, and Vernon.
Source:https://www.cbr.com/what-happened-to-marjorie-dursley-in-harry-potter/