Lady Rose is the niece of Robert Crawley, Earl of Grantham. How she is related to him is currently unknown, but as Rosamund and Marmaduke had no children[4] it is most likely through Cora.


  1. The article, which can be seen here states that most of her scenes are at the end of Series 3, and given that she looks about 20 and the end of Series 3 is set in 1921, we can give a rough estimate of her birthdate, which would be around 1901.
  2. In the article announcing that Lily James has joined Downton she states that she "likes being a brunette again" so Rose MUST be brown haired; the article can be seen here
  3. Rosamund and Marmaduke had no children, so Rose has to be Cora's niece and thus Robert's niece through his marriage to Cora
  4. When Sybil states that she feels sorry for her aunt, Mary states that she doesn't and says that she'd love to "be alone in a big house in Eaton Squarw with all that money"'; this means that Rosamund is alone after being widowed and has no children, so Rose CANNOT be Rosamund's daughter otherwise Rosamund would NOT be alone, and thus, must be a niece of Cora and Robert would be her uncle by marriage
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