Example output
Dear [Son's Name],
Happy birthday, my dear son! On this special day, I want you to know how incredibly proud I am of the young man you have become. It seems like only yesterday that I held you in my arms for the first time, and now you are about to embark on an exciting new chapter in your life as you head to college next year.
As your father, I want you to know that I am always here for you, no matter what. You have a bright future ahead of you, and I have no doubt that you will make the most of every opportunity that comes your way. Remember that life is full of ups and downs, but no matter what happens, you will always have my love and support.
I wish you a very happy birthday, my son, and I look forward to watching you grow and achieve great things in the years to come.
With love and admiration,
[Dad's Name]