Susan Heffley is Greg's mother. Though she tries to be loving, she sometimes seems dumb, embarrassing and overprotective. She and her husband pay far more attention to Manny than their other two sons, and give their youngest nearly everything he wants.[7] Susan humiliates Rodrick on stage during the school talent show in Rodrick Rules, when she performs an embarrassing dance on stage during Rodrick's band's heavy metal performance.[8] Although Manny caused a lot of trouble in Cabin Fever , she still never seems to scold off Manny. Her rat son. She even lets Manny make imaginary friends thinking he would get traumatized if she told him those

Susan heffley