[1] His father died one year after his birth and his mother remarried with the Joachim Ernest II, Duke of Schleswig-Holstein-Rethwisch.
During the consecutive wars which raged in the Spanish Netherlands, Jean-Philippe switched sides a few times to maintain his possessions.
During the War of Spanish Succession he served the new Bourbon King Philip V of Spain and fought on the side of the French and Bavarians under Maximilian II Emanuel, Elector of Bavaria, new governor of the Southern Netherlands.
Mérode had a difficult character and had personal conflicts with Prince Eugene of Savoy and the Marquis de Prié.
They had three children of whom only Isabella-Marie (1703-1780) survived infancy, marrying both times a Count Czernin von und zu Chudenitz.