We talked to my Dad, not my Mom. She is too embarrassed. He finally told her we know, but she still won't talk about it. She doesn't have ALZ, but is on 2 ALZ meds and B12 injections. We don't know dosages, and that is bad. They got in a horrific car accident last year and in the emergency room, Mom did not tell the nurse she was on Aricept - I had to go back in and tell the nurse. My Dad was injured very badly with fractured pelvis and my brother and I had to care for them for 3 weeks. Most of the time was trying to stop my mom from trying to do things she shouldn't (like carry heavy recycling out the night of the accident / using a chair as a step ladder, etc). She has fallen and broken her arm and her foot. she refuses to act her age, which is great mentally, but damaging physically.
Sorry for ranting, but it is so hard to pry information out of them and her kids really need to know, in case, god forbid, something worse happens to my Dad and he isn't there to care for her.