Family Matters: Modernise, Don’t Abandon, Ius Sanguinis 101 Instead, I would suggest replacing all outmoded rules that fail to consider parental intent and the best interests of the child in the context of children conceived through ART, whether these are family laws determining parentage or autonomous federal citizenship laws reading ius sanguinis as a literal ‘right of blood’. Open Access This chapter is licensed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made. The images or other third party material in this chapter are included in the chapter’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the chapter’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder.