Passage: On 27 June 1960, Kohl married Hannelore Renner, after he had already asked for her hand in marriage in 1953, delaying the ceremony until he was financially stable. Both had known each other since 1948, when they met in a dancing class. They had two sons, Walter Kohl (born 1963) and Peter Kohl (born 1965). Hannelore Kohl had studied languages and spoke fluent French and English; during her husband's political career, she was an important adviser to him, especially on world affairs. She was a steadfast advocate of German reunification even before it seemed feasible, and of NATO and Germany's alliance with the United States.

Question: Which brother was the youngest?
Peter Kohl