Surrogacy can become a major legal and financial dispute when biology does not unfold as expected. In 2016, Jessica Allen, a California surrogate, gave birth to what everyone initially believed were twins for a Chinese couple who had arranged the surrogacy. Weeks later, DNA testing reportedly revealed a rare and extraordinary twist: One baby was genetically related to the intended parents, while the other was biologically Jessica Allen and her husband’s son.
The case, widely reported at the time, became a complicated custody and financial dispute. According to reports, the Chinese couple initially retained the second baby and sought $22,000 before he could be returned to Allen and her husband. The family eventually reunited with the child.
The case drew attention to a little-known phenomenon called heteropaternal superfecundation , when two eggs released during the same menstrual cycle are fertilized by sperm from different men. In a surrogacy involving an embryo and a separate natural conception, this can create an extraordinarily unusual situation in which babies delivered at the same time are not genetically related.
Surrogacy itself is not new. Forms of assisted reproduction and arrangements resembling surrogacy have existed for centuries, while modern gestational surrogacy developed alongside advances in in-vitro fertilization in the late 20th century. Today, surrogacy laws vary dramatically around the world, with some countries permitting it under specific conditions and others restricting or prohibiting it. The Allen case is a reminder that a surrogacy agreement is more than a financial arrangement to carry a pregnancy. It can involve complex questions about parentage, DNA, custody, citizenship, medical decisions and the legal rights of everyone involved.
