"On October 17, 1988, Jia Jia's father, known by his surname Mao, took the two-year-old boy out to play in their neighbourhood in the city of Xi'an.

Mr Mao then walked into a hotel to ask for a cup of water for the thirsty toddler, but when he returned, he realised his son had gone missing.

His mother then spent more than 32 years travelling across all of China, through 20 provinces and hundreds of towns looking for him.

During her quest, she helped reunite 4 different children with their families before eventually finding her own son.

It turns out Jia Jia had been sold to a family in Sichuan in south-western China for 6,000 yuan."