The 2003 Parliamentary Inquiry into Child Custody Arrangements in the Event of a Family Separation is examining whether a rebuttable presumption of joint custody should be introduced into Australian law. This article notes that the Inquiry appears to be motivated by concerns to appease vocal fathers rights groups. It is argued that, based upon existing research, there is evidence that the presumption will be unworkable for many Australian families, is unlikely to be effective and may work against the best interests of many Australian children.