Ethicists have speculated on difficulties that might arise in a world where human clones exist. For example, human cloning might change the shape of family structure by complicating the role of parenting within a family of convoluted kinship relations. For example, a female DNA donor would be the clone's genetic twin, rather than mother, complicating the genetic and social relationships between mother and child as well as the relationships between other family members and the clone. In another example, there may be expectations that the cloned individuals would act identically to the human from which they were cloned, which could infringe on the right to self-determination.