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Mona J. Simpson (née Olsen), also known as Penelope Olsen, Martha Stewart, Muddy Mae Suggins, Anita Bonghit, and Mona Stevens, was the mother of Homer Simpson, estranged wife of Abraham Simpson, mother-in-law of Marge Simpson and grandmother of Bart, Lisa and Maggie.

A couple of weeks before Mona left, Homer and Abe went out fishing and the boat capsized. Homer and Abe later arrived back at the holiday home a few hours late and with no fish. Mona was just relieved that her greatest treasure, Homer, was safe. It was because of this incident, Homer thought that he was the reason that Abe and Mona split up and felt guilty about it ever since.

She eventually left her husband and son, with Abe later telling Homer that she had died whilst he was at the movies. Abe even went so far to point out a grave, telling Homer it was Mona's, although the grave belonged to Walt Whitman.

When Homer faked his death to avoid work, Mona hears of her son's death on the news and visits her son's still open grave, finding Homer in the grave, who accidentally fell in. She returns to the Simpson house, spending time with Homer and her new family, including Marge, Bart, Lisa and Maggie. She also meets Abe, although their dislike only intensifies as Abe remains angry over her leaving him and Homer, whilst Mona becomes angry after learning he had told Homer she was dead. When Homer and Mona go to the post office, to collect years worth of care packages, she is spotted and recognized by Burns. Mona is forced once again to leave Springfield, on the run from the police, although the now police chief, Clancy Wiggum, aides her escape after being cured of asthma because of Mona in the 1960s.