The richest Austrian: who inherits the billions from Heidi Horten?

When she died on Sunday, Heidi Horten was the richest woman in Austria – at least if you believe the list of the business magazine Forbes, which compiles such rankings every year.
In fact, Heidi Margarethe Goëss-Horten was never the direct owner of company investments and real estate, which together are said to be worth more than three billion euros.