Within a few months my father was making so mary mistakes that my mother was forced to entertain other explanations:Either he's stressed or not concentrating or having some mental deterioration but there have been quite a few incidents recently that really worry me. He keeps leaving the car door open or the lights on & twice in one weck we had to call triple A & have them come out & charge the battery(now I've posted signs in the garage &k that seems to have helped) . . . I really don't like the idea of leaving him in the house alone for more than a short while.