I am very sorry to read the news about your father. He was very lucky in being surrounded by his family with the classic song "The Old Rugged Cross". I know this sounds terrible, but your father is in a far better place w/no pain and suffering and he looking down on each of you every hour of the day. He will always be there to listen when you need someone to talk to.
I am also glad that your w managed to get there for one last visit. So, you are going to be a grandfather...that's wonderful! You've got a new baby to look forward to and I do hope that you will be an important part of this child's life. God has a way of making things better for us when we least expect it.
Again, I am very sorry for your loss. Please take care of yourself.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.