Shauna Harrison knows that every morning she could wake up to learn she has a new sibling.
In the past two years, she has already gone from living her life as an only child to discovering through a DNA testing service that she is one of 30 people that share the same biological father.
DNA testing services have become increasingly popular in recent years. While they have provided insights into family history and hereditary conditions, there have also been many cases of unexpected results such as catching a serial killer and making surprising connections among living relatives.
In 2017, Harrison, 41, logged back into her 23andMe account after a couple years and switched off her anonymity setting, she told CNN.
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