This paper discusses the policy debate and ethical discussion surrounding pre-implantation genetic diagnosis (PGD) for sibling donor (SD) in Germany and Israel. Based on an analysis of the regulations and ethical discourse concerning a unique form of new reproductive technology (NRT)--PGD for SD--we complement the scholarly discussion of NRTs in these countries, by pointing to an explanatory factor that has been so far neglected, namely the hegemonic notions regarding the ideal relationship between the generations, and the mutual obligations between different family members in Germany and Israel. We argue the fact that PGD (in general) and PGD for SD (in particular) have been banned in Germany, but were endorsed without hesitation in Israel, has to do with different perceptions of family ethics within the two societies. Furthermore, we argue that this factor contributes significantly to the more general understanding of German and Israeli policies regarding NRTs.