Questions about Downton Abbey

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?

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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

WILL BE JEWISH ???