The Historical Association of Northern Mazovia (Stowarzyszenie Historyczne Mazowsza Północnego) conducts genealogical workshops, which developed interests and passions regarding the creation of family archives. Many participants found French among their ancestors. It turned out that after the Napoleonic Wars, many French emigrants and refugees settled in the territories of the Northern Mazovia. Therefore, there was a problem of how we can acquire international competence in the search for genealogical ancestors of Polish families in France. It was possible thanks to implementation of international project for the staff of the association entitled “Search for an ancestor in France”.