The Mithrilen are notable for their confrontation with the O'Connell family, as the Mithrilens believe themselves to be the rightful founders and rulers of Dragon Valley. This rivalry is similar to other Sim family rivalries, such as the Capp family/Monty family or Van Gould family/Wolff family (Moonlight Falls) or Landgraab family/Alto family. The Mithrilen live in 1 Mithrilen Manor, a stone house with two bedrooms and two bathrooms, noted for it's stone architecture and vast empty basement. The house is decorated in shades of blue, which appears to be a favorite color of the family.