Good! At least we know that your fil may have received it by now or early this week. Your h opened the door for communication and I'm glad he didn't ask for anything yet. I'm hoping and praying that your fil will open his heart just a little and come to realize that his son needs him now.
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.