I am truly sorry for your loss. Unfortunately, saying goodbye is something that we all have to do at least a few times in our life. Your dad sounds like he was a great person, and the way you talk about him I can tell you have great respect for him. Make him proud of you in all that you continue to do in your life. Be the kind of person that you know he would want you to be, and use his values and marriage to your mother as an example and a guide throughout the rest of your life. Again, I am very sorry for your loss.