Dad is a character created by Melanie Martinez for her debut album, Cry Baby. He was portrayed by Mughen Nakamura in Dollhouse, although it is unknown whether he reprised his role in Sippy Cup or not.
Life
Dad first appears in Dollhouse, where he is cheating on Mom with a 'slut'. In the song Sippy Cup, Mom discovers that he is coming home with his mistress again, so she murders both of them.