The aim of this study is to distinguish the different scenarios of filiation that appear in Law 14/2006 (26 May), on assisted human reproduction techniques. Issues related to predecease of the husband, surrogacy, double maternity and other issues are detailed thoroughly in that Law. At the same time, they have tried to find the answer to specific questions that may arise, which answers are in the jurisprudence. Finally, a small comparative is inserted with Law 35/1988 (22 November), on assisted reproduction techniques, previous legislation on that matter.