Okay, I gave Otto Burl Tyner a wife named Spouse, Delete. I deleted her. That left him with a wife named [unknown spouse], to my surprise. Since she was there, I did as you suggested. But selecting the husband, going to Person, then going to Attach/Detach Person, gives you a choice of Attach Father, Attach Mother, Attach Spouse, Attach Child, Detach Selected Person. I was afraid I'd lose Otto, but I selected the last. It offered to detach him from his parents, or from the family of Father: Otto Burl Tyner, Mother: no mother entered, Children: no children entered. Still hesitant, I selected that one. And it worked! The unknown (and nonexistent) spouse vanished. Thank you!