Conversation so far:
who were ban's family?
Ban Ki-moon married Yoo Soon-taek in 1971.
did they have children?
They have three adult children: two daughters and a son.
what were their names?
His elder daughter, Seon-yong.
did the children marry?
Her spouse is a native of India.
What other family members does ban have?
Ban's brother Ban Ki-sang and nephew Bahn Joo-hyun have been indicted on U.S.
charges.

Question: Why did they have charges?
Self-contained rewrite: Why did Ban Ki-moon's brother Ban Ki-sang and nephew Bahn Joo-hyun have charges against them in the U.S?