My stepmother seems to be developing dementia, or something very much like it. At first we thought it was because of the heart attack she had years ago playing tennis (which cut off the blood to her brain for a very short time). But her mother had dementia, so she is at higher risk for it too... in any case, my dad is pretty much a full time caretaker for her. She has basically no short term memory, can't even cook a meal anymore. I'm surprised she can even drive a car.