Partiendo of the basis which science, to a greater or lesser extent, has now become the driving force for community development, must be aligned with a social construction dynamic deeply linked to the realisation of the human and social rights of everyone. In this context, the legal problem is to identify the new values introduced by biotechnological advances, in order to tackle and respond to the new social realities, which require constant legal redrafting, through constant legislative redrafting. Bearing in mind the important interrelationship between bioethics, family law and the role of the family in the composition of the social fabric; the focus of this work consisting of bioethical considerations regarding the beginning of human existence, new assisted human reproduction techniques and the nature attributed to cryopreserved embryos, in line with national legislation.