Sorry to read this. It’s never easy I can attest to that. I lost both parents in 2017. My Dad had glioblastoma so it was about 9 months of waiting but barring a miracle, you knew what was coming. My Mom soon afterwards started having mini strokes and died about 6 weeks after my Dad passed. It was absolutely not expected at all and even once things started I was hopeful she would still be around. I believe she was just heartbroken to be honest. I think of them every day.