Could this be THE WORST GIFT YOU EVER GIVE?

DNA tests are popular as presents – but they can reveal some unexpected shocks, as Jackie Brown reports

- Jackie Brown

Not that long ago, family secrets had every chance of staying that way - until the boom in DNA testing. It was 25 years ago that the first genetic genealogy tests were offered to the public. Since then, 40 million people worldwide are thought to have tested their DNA ancestry through companies such as Ancestry, MyHeritage and 23andMe.

While some want to expand their family tree, others are trying to find parents, siblings and other relatives, particularly if they've been adopted. We've seen amazing stories of emotional reunions on shows like