How can I educate the spouse of an Alzhiemer's patient who is in denial and make him accept the reality of the disease?

There is no easy way. This is a huge shock for them. The person they have been married to is "disappearing." Some adjust and some never really do. Education is crucial, but if denial is strong they often reisist even this. Try to get a good friend or faith community leader to talk with the spouse in denial. Sometimes that works better than family.
Carol