Operation Ouch! twins Chris and Xand van Tulleken get an ominous feeling when told their 18th century ancestor was a Dutch nobleman who got rich after a naval disgrace.
And that sensation turns to horror as a historian reveals Ambrosias Tulleken was a prolific slave trader who caused horrific suffering.
The BBC stars, both doctors, get the bombshell news in Who Do You Think You Are? next week.
