All of these issues run in my family. I am diagnosed with a type of periodic paralysis called Andersen Tawil syndrome. At times I have had myotonic discharges on my emgs. In my case and particular type of periodic paralysis the myotonia actually improves with the diet for hypokalemia and supplemental potassium and magnesium. These are difficult disorders to live with I hope your daughter and niece have found good doctors that are knowledgeable. My diet has made a huge difference for me. My history indicates my periodic paralysis comes down my french canadian lines. I have connected with some others clear back in the 1600s with a couple who came to new france.. or canada. Do your scranton family line diverge to and french canadian lines? My relative that I identified as a possible carrier has the surname Dube or Duby as it is known in USA. The couple we connect with came to New France in the seventeenth century... Marin Boucher and Perrine Malet.