Ko Yong-suk claims the defectors – who fled to South Korea in the 1990s – lied about her having plastic surgery and managing a secret fund.
Her lawyer says she is seeking 60 million won ($51,600) in a South Korean court.
The move is unusual – ruling family members living outside North Korea tend to avoid the public eye.
The defectors appeared on talk shows and claimed that Ko Yong-suk used plastic surgery to hide after having Kim Jong-un’s half-brother expelled from North Korea, her lawyer said.
“These defectors who often make appearances on TV are not in a position to know about her directly and what they are saying is not true,” he told Reuters.
“She and her husband find it very unpleasant.”
Ko Yong-suk took asylum in the US with her husband in 1998. She took care of Kim Jong-un when he was a teenager studying in Switzerland, according to her lawyer.
It is not clear if she will appear in court.
Ko Yong-suk’s lawyer told AFP news agency: “I’m not 100% sure, but her husband indicated she could come.”
The US House Ethics Committee has voted to release its report on former Republican Representative…
ABC News has agreed to pay $15 million to President-elect Donald Trump to settle a…
South Korea’s parliament has voted to impeach President Yoon Suk Yeol over his failed attempt…
Israeli war planes have carried out more than 100 air strikes in Syria on December…
President-elect Donald Trump has threatened to impose 100% tariffs on the BRICS countries if they…
Syrian troops have withdrawn from the city of Aleppo following an offensive by rebels opposed…