My mom has a husband she's been with for about 12 years, they're in their 60s.
He has a sister and their father recently died after a very difficult few years of Alzheimer's disease (he was physically combative on the daily).
This sister (in front of everyone) told her mom that if a person gets a diagnosis such as Alzheimer's it is the person's responsibility that they don't become a burden on their loved ones and they should end their life. I cannot imagine saying that to anyone but especially my parents.