Especially between the Japanese royal family and the Japanese nobility, if men and women marry voluntarily, then they will think it is a kind of flesh-and-blood behavior.
Because of the particularity of Japan's own system, they still maintain the existence of the Mikado system today. The so-called royal family in Japan is not like the royal family in China, but is passed down from generation to generation according to blood relationship.
Therefore, many royal families in Japan basically choose to marry their close relatives in order to keep their bloodlines pure. Because the offspring born in this way are still their own pure royal blood. In Japan, whether it is the royal family or the nobility, this kind of marriage culture handed down by ancestors in ancient times still remains in modern society.
In order not to let the property of one's family flow out: In China, when a man and a woman get married, the man's family will send a bride price to the woman's family, and in some places, the woman's family will return a part of the bride price to the man. This is the so-called return gift, which is also called reciprocity. But for Japan, they also have similar marriage customs, but such customs will only happen to the Japanese royal family or Japanese nobles.
For example, the status of the Japanese royal family is very different, and then if wealth is added, both men and women will pay a lot of bride price or deposit at the wedding. Because of this, for narrow-minded people, in order not to let the property flow out, they will choose to get married by close relatives. Because of this, your wealth will still be in your own hands
? There is no clear law, and people imitate the emperor: Japan has maintained the emperor system since ancient times. Although Japan's constitutional monarchy is different from ancient times, the Japanese emperor is still a figure worshipped by the Japanese people. The reason why the Japanese people are respectful to the Japanese emperor is because the people worship and respect the emperor. Because for the Japanese people, they will also imitate the Japanese emperor to make the choice of blood marriage in their lives.
Therefore, in the eyes of the Japanese people, since the Japanese emperor can choose to marry close relatives, so can ordinary people. Because Japanese law does not explicitly prohibit consanguineous marriage. Then naturally these ordinary people will imitate the Japanese emperor and choose close relatives to marry. This is one of the reasons why the phenomenon of consanguineous marriage in Japan exists from the emperor to the people.
Second, why can brother and sister marry in Japan? In fact, we mentioned it above, because it has a lot to do with the Mikado system in Japan, and there is no relevant legal provision in Japan to restrict the marriage of close relatives.
For Japan, the so-called consanguineous marriage is not only between cousins, because even biological brothers and sisters can get married. Although there is no law in Japan that explicitly prohibits consanguineous marriage, they also have their own express provisions. For example, lineal blood relatives or collateral blood relatives within three generations cannot get married.
But for cousins, it belongs to the fourth degree, which means it is ok for them to choose close relatives to get married. At this time, some people questioned, then what is the four parents?
If your great-grandfather belongs to the first degree, then your parents belong to the second degree, your uncles and aunts belong to the third degree, and then your cousins belong to the fourth degree. But for today's Japan, although they understand this truth, it is only expressly stipulated. So many people turn a blind eye to this. In addition to the four relatives, many third relatives are also choosing close relatives to get married.