Oh, my heart breaks for you. As T&P mentioned, good thing you kept the kitties separate, and hopfully, Edgar will live a full and happy life in his new home. Things sometimes work out, you know?

As to the the loss of Buzz, how terribly sad. I might suggest a nice note telling your sister's boyfriend how loved Buzz was, and that he is now at RB, and let time guide you further....

Hugs to you.