Kate Connolly

A glossy magazine cover depicting a bare-breasted Angela Merkel suckling the nationalist twin rulers of Poland has reignited tensions between Berlin and Warsaw — just days after a bad-tempered European summit nearly collapsed because of Polish resistance to a German blueprint on how to run the European Union.

In public, at least, they seem remarkably unfazed by what they have done. And in some senses, of course, they needn’t be. They are a loving couple, who have been together for seven years and want to be with no one else. They have had four children. Beyond these details, however, the story gets more troubling. Patrick and Susan Stubing, who live in Zwenkau, near Leipzig, Germany, are brother and sister.