In 2017, Harrison, 41, logged back into her 23andMe account after a couple years and switched off her anonymity setting, she told CNN.

Immediately, Harrison said, she was contacted on the site by a person who told her they share the same donor father.

Harrison already knew that her parents used a sperm donor to conceive her. They told her when she was 27 and had asked questions about her health and hereditary conditions. But she didn’t know how quickly and dramatically her family would expand.

One sibling turned into eight, Harrison said. Now there are 30 in all, ranging in age from 24 to 41.