When Heather Woock was in her late 20s, she started researching her family history. As part of the project she spit into a tube and sent it to Ancestry, a consumer DNA testing service. Then in 2017, she started getting messages about the results from people who said they could be half-siblings.
"I immediately called my mom and said, 'Mom, is it possible that I have random siblings out there somewhere?'" Woock says. She remembers her mom responded, "No, why? That's ridiculous."