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Nobody has ever been killed by an unloaded gun, unless they were clubbed to death. Many, many, many folks have been shot, killed, wounded or scared to death by many guns that were thought to be unloaded. This is why all guns should be treated as if they are loaded. This act of your FIL was rude, careless and socially unacceptable. As far as Alzheimer or dementia goes, the things you mentioned happen every day to health folks of all ages. Just because he doesn't behave the way you want him to doesn't make him sick or mentally ill, but you do not have to tolerate unsafe and dangerous behavior.