As I post this I am watching the first episode of season 3.
Betty Buckley is Gran'ma!
I watched it, too. I need to double-check the original character designs....don't really remember what T.C. looked like, for example. Loved the episode.
Season 3 is off to a good start.
I called myself searching for this thread and -- not finding it, obvs -- created a new thread. I have corrected my error! Thanks to Richard W. for letting me know.