[Casseres]

Keeping your name and location anonymous doesn't matter. Once a company obtains a family member's DNA information through any other source, they will see a familial correlation, use other records to realize that family member has a brother/sister/etc and might now attribute that once-anonymous DNA record to you.

That's the scary thing about these companies: you might never even use the service, but once a relative does, the company now has information about you.