Jeff,
My deepest sympathy to you and your family on the loss of your Dad. This is the time to lean on the Lord as well as each other.
I lost my Dad seven years ago on my birthday (Nov. 9th). I knew that this day would always now hold a different meaning to me than it had in the past, and I was right. Recently however, when I was talking with a friend and mentioning how my Dad dying on my birthday had kind of changed the meaning of that day for me, he said just look at it like this: On your birthday that year your Dad also had a "birthday".......an eternal one. Although I still miss him like crazy, I know that he did have a "birthday" that day and that I will one day see him again.
My thoughts and prayers are with you and your family.