We were just as surprised as them. For this video, WatchMojoUK counts down the Top 20 Shocking Reveals on Who Do You Think You Are? We're looking at the biggest reveals that shocked the celebrities and viewers at home. Let us know in the comments if you’ve ever researched your ancestry in depth.

Check out these other brilliantly British videos from WMUK:
Top 10 Darkest Family Reveals on Who Do You Think You Are -    • Top 10 Darkest Family Reveals on Who ...  
The Most Shocking Revelations on Long Lost Family -    • The Most Shocking Revelations on Long...  

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WatchMojoUK is your source for British Top 10s, covering popular shows like Doctor Who, Strictly Come Dancing, Great British Bake Off, Coronation Street, This Morning, Good Morning Britain, The Graham Norton Show, Sherlock, and more! We also cover the latest in British Movies, Music and Pop Culture - We Top 10 it all!

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