John Truong thought he was helping his sister have a nice night out with her boyfriend . Instead , he ended up an unknowing accomplice to a bizarre abduction . Police arrested Truong 's sister Alyssa Chang this week after she allegedly helped kidnap 2-year-old Ronnie Tran and his mother , with the child 's grandmother , 65-year-old Vien Nguyen . Authorities say Chang and Nguyen incapacitated the child 's mother at her home in Des Moines , Washington , bound her with plastic ties and then took the two to another home in Fife . Chang and the grandmother then took off the the toddler , leaving the mother locked in a cupboard . An Amber Alert was issued for the boy Tuesday night , after the mother managed to escape and find help . Scroll down for video . Babysitting : John Truong agreed to babysit 2-year-old Ronnie Tran ( pictured ) on Tuesday . He says his sister dropped off the boy , saying the toddler was her boyfriend 's son and they wanted to go on a date night . That same night , Truong says his sister asked him to babysit the toddler he had never met before , saying it was her boyfriend 's son and they wanted to go out on a date night . She promised to pick up the boy in the morning , but she never returned and eventually stopped answering her brother 's messages . It was n't until the next day that Truong realized he was harboring an abducted child when he read an Amber Alert on online . ' I 'm eating my breakfast , I 'm checking my Facebook , all of a sudden I see this Amber Alert for this child , ' Truong recounted to KOMO . 'And it looks like this child in my bed , and I 'm like , `` Oh my God ! What 's going on ? '' ' Truong then called police to report that he was watching the boy , who they found safe , sound an unhurt at his home . Safe and sound : Truong was reading Facebook in the morning when he realized that Ronnie had been abducted from his mother . He then called police , and they picked up the boy ( above ) . Truong 's sister Alyssa Chang has since been arrested in connection to the bizarre kidnapping . He says the boy appeared fine the night before , enjoying a quiet night in watching movies and eating popcorn . 'He was a great kid . He did n't cry much or anything . He enjoyed my dog 's company and my children 's company , ' Tuong said . Truong says he was completely taken aback by his sister 's arrest in the bizarre kidnapping . ' I feel like she was just helping her boyfriend out and just got into this horrible situation , ' he said . 'We 're family people , this is definitely not like this . Honestly I 'm at a loss for words right now . It 's just crazy . ' In the aftermath of the incident , Chang was arrested on charges of kidnapping , assault and unlawful imprisonment and is being held on $ 250,000 bail . Nguyen later turned herself into police and was questioned for several hours . Detectives have yet to reveal a motive for the crime . 'Our detectives are currently investigating this case , ' said Sgt Mike Graddon of the Des Moines Police told King 5 . 'It 's very , very complex , and that is all the information we have at this point , but Ronnie has been found . '
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 .