This paper explains how household formation rules affect the fertility and labour supply of women in the Former Soviet Union and neighbouring countries. Women who bear a male first child in countries dominated by traditional, patrilocal households are shown to have substantially lower subsequent fertility from those whose first child is female. Where households are generally nuclear, male first borns do not reduce subsequent fertility. Middle-aged women
in more patrilocal contexts often work less if their first child is male, despite reduced fertility and being more likely to reside with a daughter-in-law. In more nuclear contexts, they tend to work more. These findings suggest that household formation rules are strongly related both to women’s demand for sons and to the direction of intergenerational transfers.