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If he were to be involved in justified use of deadly force, he would have the same responsibility of proof as someone without Alzheimer's. If he were involved in use of deadly force because of his perception due to Alzheimer's, then he would have a bad legal and civil situation and probably those family members who allowed him to carry a firearm and knew of his illness. Is it really worth it?? Would you want any of your loved ones to be around anyone carrying a firearm with diminished ability to comprehend what is going on around them? Being diagnosed with Alzheimer's is tragic but it also means that he will rarely be on his own and now he must rely on his loved ones not only to assist him in every day matters but for his protection as well.

I have much sympathy for their situation and my prayers are with your friend an his loved ones.