Mrs. Zzyywicz is the mother of Kearney.
She has appeared in some episodes of the series, and was mentioned several times. In "I, (Annoyed Grunt)-Bot", Kearney mentioned that she is a stripper. In "Husbands And Knives", Dolph mentioned that she takes depression medication that makes her bloated, causing Kearney to tell him to shut up and he, Dolph and Jimbo punch each other. In "Oh Brother Where Bart Thou?", it's mentioned by Kearney that she and her ex-husband met when the prison and the insane asylum had their annual mixer. Given evidence it supports that she was in an insane asylum.