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Time to lock up the firearms in the safe or take them to a safe location (like your place). Change the gun-safe combination.

Leave a big-ol can of mace sitting around if self-protection is a problem. Worst case scenario is he peppers the wrong person and you have a laugh (and maybe a 'minor' lawsuit). Discuss it with him if you must, but you cannot responsibly leave the firearms in his care.

Some relevant scenarios:
- Air Conditioner Mechanic goes into the back yard to work on the unit (and even announces his presence at the front door), needs to go in and turn off (or on) the indoor unit. Your father thinks he is being home invaded (and rightfully so in his mind)- bad things can happen.
- Wife gets up for water, tells husband, he forgets and hears strange noises, goes to investigate....

And on, and on. Please don't allow those situations to happen.

Not a lawyer, but please consider the possibilities as this thing progresses.