Tina Knowles doesn't know what's in store for Blue Ivy's future. Source: Amy Sussman / Getty The author and entrepreneur admitted that she isn't sure whether her granddaughter will follow in her parents' footsteps and release music. This line of questioning comes after the 13-year-old took part in Beyoncé's recent Cowboy Carter Tour, dancing alongside her mother onstage for nearly the entire show. "I don't know if that's her passion," Knowles told PEOPLE at The Elizabeth Taylor Night of Compassion on Thursday, Sept. 18.