Jean-Pierre Vaillant is Michel's older brother by six years. Like Michel, he started as a driver for the Vaillante team. He married Agnès de Chanzy, the daughter of Henri Vaillant's friend living in Argentina, in the very first album. But rapidly, he became more and more interested in managing the family team and to elaborate strategies for Formula One racing. He soon became the leader of the Vaillante society, replacing his father. Able to make difficult decisions, he also does not hesitate to launch ambitious projects. He has a son, Jean-Michel Vaillant, who is Michel's godson.