He was born in Stuttgart as the son of the diplomat Ernst von WeizsÃ cker and brother of physicist and philosopher Carl Friedrich von WeizsÃ cker . His grandfather Carl von WeizsÃ cker had been Minister President of WÃ 1\/4 rttemberg In 1953 he married Marianne von Kretschmann ; they have four children : Robert Klaus von WeizsÃ cker , a Professor of Economics at the University of Munich , Andreas von WeizsÃ cker , an art professor at the Academy of Fine Arts Munich , Beatrice von WeizsÃ cker , a lawyer and journalist , and Fritz Eckart von WeizsÃ cker , a Professor of Medicine .