Last year, the Chinese wife of a Pakistani man traveled back home to China with their two children. She wanted to introduce her younger boy, 18 months old, to her mom.
But after she landed in China's northwestern region of Xinjiang, she was detained, says her husband, a doctor named Rehman. His wife is a Uighur Muslim, a member of a minority group that has been targeted in a Chinese crackdown.
Security officials left their sons at their grandmother's house. Weeks later, they returned and took away the older boy, age 6.