Her father was Eduard Delius ( 1922 -- 2013 ) , part in a long line of entrepreneurs in the textile industry of the Westphalian city of Bielefeld .
Rau is the maternal granddaughter of former President Gustav Heinemann .
Rau 's father was Eduard Delius ( 1922 -- 2013 ) , part in a long line of entrepreneurs in the textile industry of the Westphalian city of Bielefeld .
Rau is the maternal granddaughter of former President Gustav Heinemann .