Olivia is carving a pumpkin, as many do with their siblings around Halloween time. Next to her is her half-sister, Kinsey, who lives with her own birth parents.

It’s like any other seasonal family gathering, except in this family Olivia and Kinsey have a lot more siblings, at least 47 other potential brothers and sisters that they’re aware of — but they can’t really be sure…

There is some concern among experts about accidental incest, the possibility that genetic disorders could be spread more widely, and other consequences of overusing one donor. The count of siblings Olivia and her moms use is based on 47 reported pregnancies from the donor, and includes two known sets of twins.

“How many potential people out there are half siblings that she could fall in love with?” said Lori Adams. “I wish that the regulation was stronger. I wish that information sharing was greater.”