No matter what the dictionary says about the definition of niece, but I believe that my niece is my own daughter. I love you. Happy birthday.

I Was Looking The Other Day
You Have Both The Qualities To Be The Most Perfect Daughter
You Are A Daughter To Me – Happy Birthday Niece
I Already Have An Awesome Niece
You Become My Best Friend
Happy Birthday My Dear Daughter
We Always Dreamt Of Having A Daughter In Law
The Memories Of Our Friendship Will Remain In My Heart Forever