What does J.K. Rowling's deidcation in Harry Potter and the Half-Blood Prince me

Question:

What does J.K. Rowling's deidcation in Harry Potter and the Half-Blood Prince mean?

It states "To MacKenzie, My beautiful Daughter, I dedicate her ink-and-paper twin." What does she mean by twin?

Best Answer - Chosen by Asker: Harry Potter and the Half-Blood Prince
To Mackenzie, my beautiful daughter, I dedicate her ink and paper twin

Explanation: Mackenzie Jean Rowling Murray, Jo's third child, was born on January 23rd, 2005. According to JKRowling.com: "She is ridiculously beautiful, though I suppose I might be biased."

According to Emerson, who saw Mackenzie when he visited Jo's house to interview her: "She's a cute pink ball."

"I dedicate her ink and paper twin" - Mackenzie and Book 6 were being "made" (developed/written) around the same time, and were both finished (born/published) almost simultaneously, hence Mackenzie's "ink and paper twin".