Caroline Corey's son and daughter were pupils at an international school in Venezuela and were taught by paedophile William Vahey.
Neither were victims, but it is believed Vahey had scores of victims across the world.
Ms Corey told ITV News: "This man, who was a friend from to me, not only groomed our children but he groomed us as parents to trust him...It really is devastating."
More top news
The mother of a 21-year-old woman who died after taking potentially toxic diet pills has warned others to avoid using the drugs.
It's a case of mistaken identity as the actress is forced to differentiate himself from an Irish activist sharing her name
Jeffrey Okafor is accused of murdering 19-year-old Carl Beatson-Asiedu outside a nightclub in south London in 2009. His trial began today.