BBC wrote:Adult adoptions: Keeping Japan's family firms alive
In Japan, an ancient practice has provided a solution for the age-old conundrum - how do family businesses survive when there are no sons to take over?
The tale began in AD717, when the god of Mount Hakusan visited Buddhist monk Taicho Daishi in a dream and told him to find a hot spring in nearby village Awazu - today's Ishikawa prefecture.
Daishi discovered the spot and ordered his pupil Garyo Hoshi to build a guest house.
Garyo Hoshi, in turn, preached Buddhism to his visitors and adopted a son as his successor who took his childhood name Zengoro.
That is how the world's oldest family business - according to the Guinness World Records - is believed to have started.
Since then, for nearly 1,300 years, the hotel and the name - Zengoro Hoshi - have been passed down the family for 46 generations.
But in a country where a son usually inherits a family name, how have they always managed to have a boy?
Well, there is a slight catch.
"When there were only girls, we adopted a daughter's husband," says the latest Zengoro Hoshi.
"In fact, my father married into the Hoshi family and was adopted."
It is a uniquely Japanese-style adoption known as Mukoyoshi.
Japan has the world's second highest adoption rate of more than 80,000 a year but most are adult men in their 20s and 30s.
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