Officially you’re my sibling’s daughter but in my heart, you’re my daughter too! I have so much love for you and you will always be so much more than just a niece to me!
I’m sending lots of love your way on your special day today, my dear!
Now that you’re 18, my sweet niece, you can finally begin your future as an adult just like you’ve been looking forward to for so long. After all, today really is the start of the rest of your life.