Exclusive: Rachel McAdams' Real-Life Downton Abbey

Downton Abbey depicts a fictional story of servants caring for a wealthy family, but Rachel McAdams' family member lived the real thing.

In a new exclusive clip, the 35-year-old actress visits the house where her 3X great-grandfather worked as a footman on TLC's genealogy reality show, Who Do You Think You Are?

Related: Ryan Gosling Tried To Kick Rachel McAdams Off 'The Notebook'

In the clip, Rachel and her sister Kayleen discover that their ancestor was a high-ranked servant, and would have been the one to greet guests. They also, however, discover a tragic aspect of family life for those in service at that time. Watch to learn about the devastating practice that divided families.

Rachel and Kayleen's episode of Who Do You Think You Are? airs Wednesday night at 9/8c on TLC.