Susan Moller Okin's critique of libertarianism in Justice, Gender, and the Family has received only slight attention in the libertarian literature. I find this neglect of Okin's argument surprising: The argument is straightforward and, if sound, it establishes a devastating conflict between the core libertarian notions of self-ownership and the acquisition of property through labour. In this paper, I first present a reconstruction of Okin's argument. In brief, she points out that mothers make children through their labour; thus it would (...) seem that mothers own their children; but this implies that the children are not self-owners. I then examine the two most common objections to this argument in the literature: mothers do not make children, and acquisition by labour includes an exception for persons. I give several replies to each objection, including an extension of Okin's argument that I call Okin's dilemma. This dilemma argues that the libertarian can avoid Okin's conclusion only by requiring an.. (shrink)