The celebrity this week on Who Do You Think You Are? is Rosie O’Donnell. Rosie’s mother died when she was only 10 years of age. So she wanted to investigate her mother’s heritage. Rosie’s journey takes her from the Jersey City (NJ) Main Library all the way to Ireland. Watch this week’s episode on NBC at 8 PM Eastern and Pacific time. For a good extended biography of Rosie see this one on the WDYTYA? website.