I lost my Dad at a young age (I was 20, he 42). Carried much baggage over it for years.
So, talk to him now and apologize if you haven't. Here's how. Find a nice quiet time and place, doesn't take long, doesn't require prep. In a safe place, close your eyes, take a couple deep breaths, and Go back to those memories as an observer, but as if present at your current age. Play the scene back a little, then step back to your current age and apologize. Maybe even have an additional little conversation and see what he says to you (and pay attention this time).

Maybe as some people believe, our soul lives on. Sometimes our loved ones hanging about a bit, sometimes moving on to the next life right away. Either way, have you ever called or emailed someone long distance and had them or yourself say, "Wow, I was just thinking about you"? We are all connected in this universe, (and the next) for those that believe.

Or maybe as some people believe, when a body dies, it just dies. In that case, going through the mental exercise will still have a base in reality to your subconscious brain. Ever wake up from a nightmare with your heart beating fast and your body tense? Our subconscious brain does not know the difference between reality and dreams or imagery, it only knows what it experiences. Let your conscious brain let go the drivers seat for a bit, let your subconscious experience a few moments with your Dad, even if the responses are not real, they are based on the memories of your Dad and the responses your subconscious knows that would be true to his real patterns. The ones your subconscious memorized, not the ones your conscious mind made up.

I'd be interested to hear the outcome of your exercise and any interesting advice he has for you now.

Enjoy!
K