At their home in Leipzig, Patrick Stuebing and Susan Karolewski are in the kitchen, playing with a young toddler. They share a small flat in an east German tower block on the outskirts of the city. It looks like an ordinary family scene, but Patrick is Susan's brother and they are lovers. "Many people see it as a crime, but we've done nothing wrong," said Patrick, an unemployed locksmith. "We are like normal lovers. We want to have a family. Our whole family broke apart when we were younger, and after that happened, Susan and I were brought closer together,"...