Here are some examples of unique and heartfelt birthday wishes for your nephew:

"Happy birthday to my amazing nephew! I am so proud of the young man you have become. I love you more than words can say."
"To my dearest nephew, happy birthday! You are the light of my life and I love spending time with you. I hope you have a day filled with joy and laughter."
"Wishing my nephew a very happy birthday! I am so grateful to have you in my life. You are a wonderful person and I love you very much."
"Happy birthday to my awesome nephew! I hope you have a day filled with all the things you love to do. I love you more than anything in the world."
"To my nephew, the best nephew a person could ask for, happy birthday! I hope you have a day that is as special as you are."

https://www.cardswishes.com/bi....rthday-wishes-for-ne