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Sometime after Nelson was born, Mrs. Muntz's husband left her, because she developed an addiction to cough drops.
Mrs. Muntz began a job as a stripper called Hooters.
Marge Simpson once 'adopted' Nelson because his mother was neglecting him. Sometime after this, Nelson's father returned and the family reunited, with Mrs. Muntz having acquired a job portraying Lady Macbeth in the play Macbeth, after sleeping with the player's director. However, this was short-lived, when Mrs. Muntz began a relationship with Moe Szyslak, and then married a clown. She also had sex with Krusty to get Nelson a place on Krusty's show.
Mrs. Muntz seemed more caring to Nelson upon an accident following an unauthorized school trip hosted by Springfield Elementary School's then-Superintendent Chalmers, when she hired a lawyer to sue Springfield Elementary.
Mrs. Muntz began a job, also as a stripper, at Classy Girls Strip Club.