When Laura* got engaged, she and her fiancé decided to take an at-home genetics test from 23andMe, just to find out if the two of them had any health risks they should know about. Laura’s mom had Alzheimer’s, which particularly concerned her. When her risk came back at 12.5 percent, she asked her parents to take the test, too. When she got the results, she noticed something strange.
“My dad wasn’t in there as my relative,” says Laura.
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