Heredity, in its anthropological and social dimensions, appears as one major identity stake. In Reunion Island, the sharply contrasting origins of the population (Africa, Madagascar, Comoros, Europe, India, China) through a process of admixture, generated a very diversified phenotypic panel within most families. The result from these various cultural meetings leads to envisage the existence of singular representations about what can be called heredity: the transmission of distinctive characteristics over the generations. These distinctive characteristics, i.e. the constitutive traits of the person or the group -whether they are bound to biological and/or cultural heredity- are the basis of the individual and familial identity construction. ...