Shirley MacLaine will be in the 3rd season of Downton Abbey, playing a woman named Martha Levinson. Reported to be married to Isidore Levinson.

Does this mean that Cora Crawley is Jewish?

And that the three daughters are Jewish? Including the beautiful Mary?

And if Mary marries Matthew, as is likely, their children, if any, will be Jewish?

And if they have a boy, the next in line as Lord Granthem of Downtown Abbey