that I can't keep things in mind.
Poor granny, wandering room to room, wondering why she's there. It's a symptom connected with reduced brain mass caused in my case by M.S.; caused in granny's case by aging. In medical research at this time, that's as much as we know about the cause of that symptom.
Pshaww on research. You will have a hard enough task trying to keep in mind that we can't keep things in mind--if you care about me or granny.