In between winning Grand Slam titles and gold medals, tennis champion Serena Williams, 40, has penned her first children's book. This week, Williams made public the news of her upcoming book, titled The Adventures of Qai Qai , scheduled for publishing on Sept. 27, 2022, by the MacMillan imprint Feiwel and Friends. Yesenia Moises will serve as the illustrator. The picture book's characters are based on personas created by entertainment technology company Invisible Universe, for which Williams is a partner and investor. The Adventures of Qai Qai will focus on a doll that both Williams and husband Alexis Ohanian, 38, gifted their 4-year-old daughter, Alexis Olympia Ohanian Jr., some time ago. View this post on Instagram A post shared by Serena Williams (@serenawilliams) Williams is in charge of the Instagram account for Qai Qai, which has thus far amassed about 353,000 followers. View this post on Instagram A post shared by Qai Qai (@realqaiqai) "People follow Qai Qai's social media...