Mum is the mother of Horrid Henry and Perfect Peter and is Dad's wife. She always tells Henry off, and hardly Peter because Henry refers to him as 'Goody-two-shoes'. She regularly says, 'Don't be horrid, Henry!' to Henry in the TV series, and 'Stop being horrid, Henry!' in the animated version. She usually sends him to his room like Dad. She does this by saying, 'Go to your room right now, Henry!'. Unlike Dad's, the series didn't reveal her first name. After what happened in Moody Margaret Moves In, she disliked Moody Margaret. She is 5 foot 10.