Die Samenhändlerin (2011)

The rich Kerner family excels in the sole trade in a German town, producing ornamental flower seeds. One of the heirs is engaged with an ambitious lower class daughter, but the marriage is prevented by an affair and he marries another. The scorned woman seduces and forces to a marriage his brother. The couples and parents live in one house, but very tense, there's even sabotage that may wreck the firm. The last hope is selling a new range of brightly-colored flowers for the Hungarian market.