From the New York Times:
For children who often feel severed from half of their biological identity, finding a sibling - or in some cases, a dozen - can feel like coming home. It can also make them even more curious about the anonymous father whose genes they carry.
The half-sibling hunt is driven in part by the growing number of donor-conceived children who know the truth about their origins. As more single women and lesbian couples use sperm donors to conceive, children's questions about their fathers' whereabouts often prompt an explanation at an early age, even if all the information about the father that is known is his code number used by the bank for identification purposes and the fragments of personal information provided in his donor profile.
Donor-conceived siblings, who sometimes describe themselves as "lopsided" or "half-adopted," can provide clues to make each other feel more whole, even if only in the form of physical details. Liz Herzog, 12, and Callie Frasier-Walker, 10, for instance, carry the same dimple near their right eye.
From the New York Times:
