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However, often the most helpful thing is knowing you aren't alone in your grief. If you check with your local hospice, they have grief groups filled with people like your dad.
Good luck. You are kind in your concern. It will, indeed take time, and he may never fully recover, be he isn't all that old by today's standards. If he can get through this, he could have some reasonably contented years. Please keep trying to help him find peace.