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However, you should be able to get breaks from caregiving, too.
I suggest you maintain avenues of communication open with your husband at all times, particularly when you need assistance in caring for YOUR father. Let him know ahead of time, as even if he has no clear cut plans for the day he might become resentful if you don't.
Most retirees I know don't know what they're retiring to; and caring for the elderly isn't and probably will never be their idea of spending the time set aside to enjoy the rest of your life and the fruits of many years of labor. Be supportive. If he wants to go hunting, don't stand in his way. He's earned it.