Abstract : This thesis focuses on the thin tapestry of kinship relations among lesbian couples that resort to the use of new reproductive technologies (NRT) to form families. The research took place in two countries, Brazil and France, where dissimilarities are configured in what concerns the access of same sex couples to new reproductive technologies. Being allowed in Brazil, they are legally barred to homosexual couples and single people in France, which configures two different contexts on the formation and comprehension of homoparental families. Thus, the focus of this work reflect the ways in which women couples use different strategies, depending on the legal and technological contexts available, to produce children that can be attached to the two parts of a couple. The description of the paths that women draw to the construction of their families is analyzed in order to reveal which elements matter more or less in the production of connections and bounds between people that establish themselves as relatives. On this journey, the access to NRT, as well as the legal recognition of lesboparental families, are both important to the understanding of how two joint motherhoods are built on the bosom of a lesbian woman couple. The intentional production of double motherhood is the thread that leads the discussion, in this thesis, of how the kinship relations are relevant in today s public and politic scenarios. Therefore, I elucidate the webs that surround this reproductive universe and the impacts that the use of these technologies and procedures has on the bodies, people, laws, relationships and on the discussions about the concepts of kinship in Brazil and France. The fieldwork that feeds this thesis was carried out between the years of 2012 and 2017 in Brazil and France. It has the participation of Brazilian and French women, as well as establishes itself in the middle of a context of high media, political and social discussion about the new reproductive technologies and about the opening of same sex marriage in both countries. In this sense, this ethnography seeks to present important contributions to the field of Anthropology by analyzing how motherhood and lesbian relationships are connected in the production of kinship relations and how these relations contribute to the pluralization of the ways of being a family.