I have known many people with this illness.
For some it is best to be in a care place where they will not get hurt,
for others the siblings decided to care for the parents at home. I hated watching a woman friend to my Mom who was placed in a home and just was in bed till she died, maybe that was best- but it was hard to watch.
I don't know if there is any connection, but I read once about Gluten and Memory loss. You might read up on that and just see... I really don't know.