Central Core Disease (CCD) is a myopathy closely linked to malignant hyperthermia (MH) susceptibility. We present a family with a girl suffering from CCD. Due to the CCD diagnosis, all available relatives were investigated for MH-susceptibility. No other family member has CCD. In vitro contracture tests revealed that several relatives are MH-susceptible. Thus our results suggest that healthy members of families with CCD could be at risk for being malignant hyperthermia susceptible.