Wie Tag und Nacht (2013)

Grumpy widower Oliver Maibach runs a successful bakery with his mother, equally lonely widow Elisabeth. She hears their senior immigrant supplier Kemal Yildirim fears eviction back to Turkey and decides first to take him in to hide in Oliver's bedroom, given his reversed day-night rhythm, later insists on a fake marriage, but Kemal is not amused to discover her desperate dating past. Oliver's daughter Lisa and especially her cop fiancee Chris Dollinger are shocked even more to discover the illegal 'guest' and ensuing green card fraud plan, but end up playing along during their wedding to save her ancestors, or so everyone thinks. Oliver has an impractical affair with a customer, mouthy cellist Greta.