i would tell them.

i'm in a situation now where an elderly caregiver is developing strong signs of Alzheimers. i did try to talk to his daughter over a week ago. i told her that he was getting confused and disoriented. i said "the next thing you know, he'll be getting lost"......she pooh-poohed me.........a week to the day that i contacted her, he got lost, here in his hometown, one night for 30 minutes. he told me the next day how scared and confused he was.........

at least i've warned the family.

you should disclose everything......stay one step ahead of the pack......i've covered my ***..........cover yours.