lemm,

The first thing is to check for any Aluminium exposure. If any of your dad's cooking utensils are aluminium they need to be replaced by steel or ceramic. Also if he takes any indigestion remedies, such as Gaviscon or other brands containing aluminium, they should be changed. Also the water supply to his house should be checked for aluminium levels.

Aluminium is not the only cause of Alzheimers, but it is a major one.

The progress of Alzheimer's Disease can be slowed [or even stopped and reversed occasionally] by homoeopathy. This requires expert homoeopathic care, so he needs to be found a genuine expert competent homoeopath to take his case and to see him regularly for assessment.

Also, for you and your family, I recommend two books by John Bailey called "Iris - a Memoir" and "Iris and the Friends" in which the author lovingly describes his care of his wife as she suffered Alzheimers. I think it would give anyone in your situation a lot of courage. I found the books personally helpful.