The article aims to complicate efforts to make law fit or catch up to social practices. It scrutinizes the 'reflective claim' using the case study of recognition of parenting by lesbian couples. Reforms in the United Kingdom's Human Embryology and Fertilisation Act 2008 and the Canadian province of Quebec's civil code are compared with empirical work from the social sciences on lesbians' family practices. The reflective claim rests on problematic ideas about social practices and law. Since law is always blunt and incomplete, choices must be made as to which practices it should aim to recognize. Furthermore, the impact of heterosexist and homophobic conditions on lesbian families means that observable practices may not be a suitable model for gayaffirmative reforms. As advanced in the literature, the reflective claim overlooks law and society's complex interaction, including how reform will not merely reflect but also alter practices. It fails to do justice to law reform's normative character, obscuring its costs and positive potential.This article's argument concerns the complex relationship between empirical evidence of social practices and well-intentioned law reform. It is a reminder that reform will not merely reflect social practices, but also intervene in them, in unpredictable ways. Law reform cannot respond to all practices in a given area, and so requires choices that are