The unnamed Murderous Mother is a villainess from the 2018 horror-comedy, Mom and Dad. She was shown in the very beginning of the movie turning off her car radio, which was omitting static. As the scene indicated, the mother was driving with her infant when she suddenly stopped at the train tracks.
After turning off the radio, the mother turned heel and suddenly walked out the car as the train was coming. The evil mother continued walking out as the train sped up and eventually struck the car, killing her infant offspring inside. As the film's progression revealed, the static was causing parents to suddenly become psychotic and kill their children, and it was the very case regarding the mother becoming a villainess and killing her baby. Her fate after her murderous actions was not revealed.