Che was married twice. I even knew the second one was named Aleida March but possibly only because some friends have a cat named Aleida. The first one was named Hilda, but I can't remember her last name, and she doesn't count anyway because Che wasn't into her.
Jon Lee Anderson interviewed and obtained notes, diaries, etc., from March for A Revolutionary Life. And he moved his family to Cuba for a few years during his research. As I am barely past the revolution in the book, there hasn't been a lot about March as she is now, but it seems odd that Anderson can just talk to her and she's not under glass in the Museum of the Revolution.