The explosion in popularity of at-home DNA testing kits has led to dozens of Americans uncovering shocking family secrets - including a man who discovered he had 30 siblings, and another who found out her husband was actually a relative. Around two in 10 Americans have taken a mail-order test, according to data from survey site while the global gene-testing market is now worth around $14 billion. And experts say the trend is being driven by the availability of cheap and accurate tests, with the two major providers - 23andMe and AncestryDNA - offering them for just $99.
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