Reba McEntire will embark on the journey of a lifetime Friday night when she explores her roots on the NBC TV show Who Do You Think You Are? She'll be focusing on her mother's ancestry, which will take her to Raleigh, North Carolina. According to NBC, someone in Reba's family was "connected to one of the darkest periods of American history." She'll also learn about her ancestors' "heartbreaking" trip to America. Who Do You Think You Are? airs tonight at 7pm on WEEK 25.