Letter to my dad (sent/don't sent it)?

I definitely think you should send it.........I think some of the wording could be different but that is just minor. And my reasoning for this is that your goal is to have him respond so you don't want to give him any reason to dismiss it. I am sure this is very sensitive for you and for him and it may be healthier for you to focus on what could be instead of what was. I think you should address the letter with his first name. Thinking of you!!!!!