We have a number of distant cousins with the HD problem ~ but we don't. They are descendants of one of the two young women who came up to Indiana from Venezuela a century and a half ago.
Remember the way they used genealogical information to track and trace on HD to demonstrate that it was genetic in origin? That information is sort of available on the net ~ in several genealogies ~ but all the lines to/with HD are not on it. Handy for the rest of us ~
I had read that HD can occur every other generation.