The French Court of Cassation has issued a ruling clarifying the strict criteria required to prove French nationality by descent. The case involved a child born in Senegal in 2009, whose parents sought citizenship based on the grandfather's employment in France during Senegal's independence in 1960. Despite presenting evidence of social security contributions and employment records, the court ruled that these documents were insufficient to establish a stable and permanent residence in France at the time. The judges noted that subsequent events, such as the grandfather's marriage in Senegal in 1961 and the birth of his children there, indicated that his life was not centered in France. The ruling confirms that professional records alone do not guarantee the status of permanent resident required for citizenship claims.