The children of Austrian-born oil and construction tycoon Richard Lugner and his newly-wed sixth wife, Simone Reiländer, may be headed for a nasty legal battle over his will after the billionaire died at the age of 91 on Monday, according to the German outlet Bild. Lugner, known for entertaining A-list celebrities such as Kim Kardashian, Jane Fonda, Priscilla Presley and Goldie Hawn at the Vienna Opera Ball, married Reiländer on June 1, according to Bild. However, sources close to the situation told Bild that Lugner’s fourth wife, Christina Lugner and her daughter with Lugner, Jacqueline, “will fight with all means to ensure [Jacqueline] gets as much as possible.” Lugner installed Reiländer as the boss of his Vienna mall, the Lugner City shopping center, on Aug. 1, and a month earlier revised his will to include her. “She should be protected when I say goodbye. That’s why I will also revise my will. Because whoever lives with me when I die should also inherit accordingly,” Lugner said of his new will in April. Lugner’s sons, Alexander and Andreas, inherited his construction company previously, despite Lugner breaking off relations with Andreas recently, according to the Daily Mail.