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 . WeizsÃ cker was born in the New Castle in Stuttgart , the son of diplomat and politician Ernst von WeizsÃ cker and Marianne , nÃ e von Graevenitz , a member of the noted WeizsÃ cker family .