Malaysia's top court in a landmark decision says both parents must consent to the religious conversion of a minor, ruling in favor of a Hindu woman whose ex-husband converted their three children to Islam.

M.Indira Gandhi became caught in a high-profile dispute after her former husband became a Muslim and converted their three children without telling her in 2009. He also snatched their daughter, then 11 months old, from the family home.

Malaysia has a dual court system, secular and religious. Gandhi challenged her children's conversions through the civil courts.

The Court of Appeal ruled that civil courts had no jurisdiction over Islamic conversions, but that decision was appealed to the nation's highest court.

The Federal Court on Monday annulled the children's conversions as they were done without Gandhi's consent.