John Truong of Renton , Washington says sister dropped off 2-year-old boy Ronnie Tran at his house Tuesday . Sister Alyssa Chang told him the boy was her boyfriend 's son and they wanted to have the next morning . While scanning Facebook a date night , Truong read an Amber Alert issued for the boy and then called police . Truong 's sister was arrested for kidnapping Tran and his mother , with the help of the toddler 's grandmother , 65-year-old Vien Nguyen . Nguyen later turned herself into police for questioning . The motive for the abduction has not yet been released .
John Truong of Renton , Washington says sister dropped off 2-year-old boy Ronnie Tran at his house Tuesday . Sister Alyssa Chang told him the boy was her boyfriend 's son and they wanted to have a date night . While scanning Facebook the next morning , Truong read an Amber Alert issued for the boy and then called police . Truong 's sister was arrested for kidnapping Tran and his mother , with the help of the toddler 's grandmother , 65-year-old Vien Nguyen . Nguyen later turned herself into police for questioning . The motive for the abduction has not yet been released .