This post was edited by tripletmom83 on Fri, Feb 7, 14 at 15:55
If it is dementia, then it's farther advanced and he should have many other (and obvious) symptoms. Your friend and her family need to get more involved in father's life. She might get info by calling the local branch of the Alzheimer's Association.
But it could also be a number of other causes. Dementia itself can be caused by many factors.