Nintendo never said directly that it can "cure" Alzheimer. I saw the commercial and I understood that it only meant as it can help you have better memory and such. Maybe your mom has misinterpreted the commercial... Still it can help and she could have fun with the game so why not?
About Wii Fit, I don't think it can make someone really fit but it can help people getting progressively more active, like a little start, plus it's fun! So it motivates them to exercise.







