When it comes to parents, it seems that three or even four is no longer a crowd. At least, that’s the conclusion one might draw from the case of Sheena and Tiara Yates, a married lesbian couple in New Jersey. They’ve had their parenting expectations upended—twice—by the sperm donors of their two kids. Both men agreed, in writing, to provide their raw materials and to leave the parenting to the women. But then they decided that, after all, they’d like to have some role in the lives of their biological children, so they applied for visitation rights. As of now, the bio dads are winning. Their case is just the latest reminder of how perilous and confusing assisted reproduction cases can become.