Her husband had long ago left her for another woman, and her only son Hans lives in Berlin where he studies architecture.
She receives a letter from her son Hans one day, informing her that he is engaged and wants to get married in his home town, and that he and his fiancé Nicki will be visiting in the upcoming week.
In the meantime, Hans shows Nicki around town, which leads to a local spotting the couple kissing while out on the lake.
It is only sometime afterward at the opening of Christian's second auto dealership that he hears of the rumor, and makes an announcement telling everyone that despite what he had heard he is Hans' birth father.
Furious, Kathrina punches Vera, and Katharina and Christian drive to Berlin together to talk to Hans.
The movie then ends with the very same church choir that temporarily kicked off Kathrina, giving a surprise performance of "All You Need Is Love" by The Beatles.
The film was shot in the cities of Bad Bayersoien and Munich, of the Bavaria region of Germany.