In-vitro fertilization, or IVF, is becoming common today as potential parents grow older, but there aren’t enough sperm donors to go around. The result? Families whose children are all related, through their fathers.

One investigator found that one sperm donor fathered 150 children. One of these parents sometimes even takes vacations with her son’s IVF siblings. In the September 6th edition of the New York Times, Jacqueline Mroz quotes her as saying, “It’s wild when we see them all together–they all look alike."
read more