Mona Simpson, also known as Sunny, was the mother of Homer Simpson, mother-in-law of Marge Simpson, paternal grandmother of Bart, Lisa and Maggie Simpson and first wife of Abraham Simpson II. Mona was strong-willed, righteous and caring, always doing what she knew or thought was the right thing no matter what. She cherished the relationship she had with her son and later her grandchildren and daughter-in-law. Despite her friendly nature, she was shown to hold distaste for her ex-husband and Homer's father Abe due to his irritability, intolerance and questionable parenting methods concerning their son, even berating him for telling Homer she had died. She also disapproved of those with ill intentions, as seen when she joined a radical group protesting biological warfare experiments and other unscrupulous activities by Charles Montgomery Burns. Overall, she seemed to bring out a more vulnerable side of Homer reminiscent of the innocent child he was before she left. (Source: Fandom.com, CC BY-SA)