In France, nearly 800,000 people were confronted in 2019 with this nagging question: how can I ensure that my partner's children accept me? If fathers-in-law are three times more numerous (584,000) than mothers- in-law, the latter live more often with their step-children. Although this situation is increasingly common, “ there is still no statutory recognition of the step-parent,” underlines Catherine Audibert, psychologist and author of “Love and crises in the reconstituted family”