Something similar happened in my family. My parents health had been deteriorating in a number of different ways since before the pandemic. The key thing being that my mum’s physical health was relatively good but her mental health was not alzheimers was the main issue for mum. My dad’s mental health was good but physically he was deteriorating quickly due to asbestosis. Fortunately we had obtained both welfare and financial guardianship, we could see that my dad was no longer able to look after himself never mind anyone else ,care at home just did’nt have the staff so my mum went to a home we had reasonable confidence in, but my dad died in hospital less than 48 hrs later.
So the main points for me is take action early.Have those awkward conversations It is always tough and only gets tougher as time goes on especially when the roles are reversed and you find yourself explaining to your parents that sensitive decisions such as where they can die are being taken out of their hands