Hauteclocque's older brother Guy had married Madeleine de Gargan, the daughter of the Baron de Gargan. Philippe became a frequent visitor to the Gargan household, and became enchanted by Madeleine's youngest sister Thérèse. The two courted while he was at Saint-Cyr. In the tradition of old noble families, Count Adrien asked Baron de Gargan for permission for Philippe to marry Thérèse. The wedding ceremony took place in the Church of St Joan of Arc in Rouen on 10 August 1925. For a wedding present, Adrien gave them a chateau in Tailly. They had six children: Henri (1926–1952), who was killed in the First Indochina War; Hubert (1927–), who served as mayor of Tailly from 2001 to 2008; Charles (1929–); Jeanne (1931–); Michel (1933–2014); and Bénédicte (1936–). Philippe and Thérèse hired an Austrian governess, and spoke German in front of their children to improve their command of the language.