Nancy

Nancy Jeffy is a mentioned character in Mario The Babysitter! and Jeffy's Sister! and appears in Jeffy's Parents! as the main antagonist. She is a drunk and abusive prostitute who left Jeffy with Mario because she hated him.

A year later, she came over to Mario's house to get Jeffy back after finding out that Jeffy was to inherit a million dollars from his father. Even though she beat up Jeffy and belittled him in front of Mario and Rosalina, Mario didn't care. In the car, she starts treating Jeffy like crap and beating him senseless. Jeffy escaped and went back to Mario's house, begging the plumber to let him stay with him and the gang. He also genuinely promised to stop annoying Mario and disobeying him. Then, she was arrested for abuse, prostitution and other things. Mario then decided to let Jeffy stay.

Trivia

 * While it's said that Jeffy's mom and dad hate him, them writing the note may actually mean that they care about their son and Jeffy may have been kidnapped. This wouldn't have happened if they hate Jeffy.
 * However its revealed that Jeffy's mom didn't care, so it's possible Jeffy's Dad, was the only one that cared.
 * She will likely become the most hated SML character of all time due to torturing Jeffy
 * Many fans believed that Princess Daisy was Jeffy's mom. However, this was confirmed by Logan to not be true in a stream with SML Reviewer.
 * She is without a doubt, the most evil and depraved of all of the villains in the series.
 * It is her fault Jeffy acts like a jerk towards Mario.

​Poll
Do You Like Jeffy's Mom? Yes! No. Kind Of.