Tang Kai arrives at Mianyang railway station in Mianyang, Sichuan province, May 7, 2016, in the company of volunteers. [Photo/VCG]

How to celebrate the reunion with a son who was kidnapped and trafficked 25 years ago? For the lucky family in Southwest China's Sichuan province the answer was a belated wedding, although the son is married and has a son and a daughter.

Tang Kai, 29, was kidnapped when he was four in the winter of 1991 from a village in Santai county, Mianyang city in Sichuan province, when he was playing alone near a kindergarten. Tang was sold about 1,500 km away in Zaozhuang in East China's Shandong province and given a new name, Liu Cunzhu.

Tang registered at baobeihuijia.com, a non-profit website that helps people find their lost family members, on Sept 10, 2015, trying to find his biological parents with his sketchy memories of the surroundings when he was kidnapped.

Based on the information and DNA tests, Tang finally found his parents in April.

After finding out that Tang had got married but did not have a ceremony, Tang's father decided to hold an event, however late, for his son.