Quote from Baalzebup
We do have an instance of a shinigami wielding and even achieving bankai with his wife's zanpakutou, after all.
Who was that? I only remember two marriages in the Bleach canon material: Byakuya-Hisana and Isshin-Masaki. And I don't remember there ever being an indication that Senbonzakura was originally Hisana's. Someone correct me if I'm wrong (chapter numbers preferred).
Edit: Oh, and Shiba Kaien had a wife too. But nothing there either from my memory.