Ida Kenzel is a recurring antagonist in the 2000 popular comedy series Malcolm in the Middle. She is the evil-minded mother of Lois. She was even more sadistic and cruel than her infamous daughter and unlike Lois did not really seem to be doing these actions out of a misguided sense of justice, indeed she was a vindictive and mean-spirited woman who was supposedly even crueler than Lois could dream of being in regards to upbringing her children.
Ida has not changed much over the years and in a display of almost undeniable evil she went as far as drugging a wealthy chinese man in order to effectively force him into marrying her - making him happy around everyone, even the unpleasant Ida. She also began drugging Malcolm's entire family (even baby Jamie) when they tried to stop her scheme but this proved to be her scheme's undoing because she used all the drugs on them, the chinese man came out of it just in time and ran off.
However, she does have some love for her family. Ida has saved Dewey's life once in the past, which cost her her leg, (Hal has told Dewey it is her only chance to get into heaven) and is also openly affectionate towards Reese due to him being the "strong" one and also the one that does not question her authority - she dislikes Malcolm because he is neither strong nor does he tolerate her abusive behavior. Also, according to Francis, she's threatend by anyone with an ounce of ambition, which may explain her hatred of Malcolm.
She is so horrible that whenever she appears, the family is forced to stop fighting and form a truce to get rid of her.