I'm so sorry to hear this. He sure was a very handsome boy. I can only hope to have my own cats for 24 years. That's amazing. I'm sure that your sister must be feeling devastated right now but I hope that in time she'll feel better enough to maybe adopt another cat or dog. RIP sweet Muffy. My thoughts and prayers are with you and your sister during this difficult time. Please take care. (((HUGS)))