Shenzhen, Guangdong Province has the largest number of son-in-law. According to relevant information, Shenzhen is the richest city in Guangdong. If the family is a daughter, there is no requirement for money. According to statistics, Shenzhen has a high share of door-to-door sons-in-law, so Shenzhen, Guangdong has the most door-to-door sons-in-law. Shenzhen, Guangdong is one of the first four special economic zones opened to the outside world in China.