Yes, it's still all a bit confusing I admit, but the most specialized member of my care team, a movement disorder specialist at a major teaching program says it is quite possible to have both PD and essential tremor and either can manifest as different forms of tremor. He expressed no particular opinion about the glove, other than it was "interesting".

I'm sure your husband and I are both most eager to have our functional tremors treated, but while DBS is mature science and practice, it is dauntingly invasive, while HIFU is relatively new and is irreversible since it ablates (kills) brain cells. Potentially, the glove might avoid all these concerns and so far, to me at least, it seems worth waiting a bit to find out if it might be a viable option.