Being interested in genealogy, I think the Tennyson have following ancestry. Red hair. That suggests Scotland, Ireland and Wales. The name Tennyson comes from Britain. With Ben's mom being an American blonde woman I think it is fairly likely to say that she is of mixed Norwegian and German ancestry. So they are North-western European WASPS. Not Jewish. But then again, they are in america. Ben's mom is a natural health freak, so I'd say probably not.