09/03/2008 AT 09:45 AM EDT
Has John McCain's daughter, Meghan, already put dibs on a White House bedroom?
That was the question put to the 23-year-old by a cub reporter from
Nickelodeon Tuesday, as the would-be First Daughter unveiled My Dad, John McCain
, her illustrated children's book about her
father's life story.
"No," McCain replied to the bedroom query. "But Jenna Bush did show me her
room in the White House and it's beautiful." She added with a laugh, "But they're smaller than you might think!"
As McCain autographed books for nearly 100 well-wishers at the Republican National Convention, her mother Cindy and three younger siblings – Jack, 22, Jimmy, 20 and Bridget, 17 – playfully cut in line.
"I'm so proud that she would be an author at such a young age but, more important, that her first work would be about her father," mom Cindy boasted.
Meghan McCain, who blogs about her family's behind-the-scenes campaign
adventures at McCainBlogette.com
said that tagging along on the stump is the most fun she's ever had.
"I feel like I'm living out my rock-n-roll fantasies, living on the
bus, hitting the road."
PEOPLE chats with the McCains aboard the 'Straight Talk Express'
25 Questions for John McCain