Who was the father of the manager during the 2013–14 Feyenoord season?
2013–14 Feyenoord season:  It was the third straight season with manager Ronald Koeman, who did not renew his contract at the conclusion of the season. Ronald Koeman: Ronald Koeman (] ; born 21 March 1963) is a former Dutch footballer and the current manager of English club Everton. Ronald Koeman:  He is the younger brother of former Feyenoord coach Erwin Koeman and the son of former Dutch international Martin Koeman.
Martin Koeman