In this article, based on research carried out in Spain on lesbian parent families, I show how the desire among lesbian partners to share motherhood often includes not only sharing day-to-day life and the legal recognition of parenthood, but also the reproductive process itself and breast feeding. The increasingly more common tendency among lesbian couples to resort to assisted reproductive technology methods that entail using their own genetic or biological material, beyond other ways of accessing parenthood, prompts a reexamination of the value placed on biology in the representation of motherhood, the conjugal relationship, and family which is emerging in these couples.