That night, Chu Xuan, who finally confirmed that he was, turned on the super laptop connected to the Internet, and continued the investigation of "someone".

Chu Xuan's "setting" is that his parents are divorced, and his mother Moeko Ito, who is a nurse, live in a high-end apartment together.

As for his "father" on the setting......

In the information database of the civil affairs system, the man named "Ze Yue Zhi" has divorced Ito Moeko, and Chu Xuan also has a "sister" named "Ito Zhi" who was awarded to his father.

――Because there is also the name of "Ito Zhi" on the achievement of "Favorite Close Relatives ~ Annihilation", Chu Xuan can be sure that in the "setting", this sister is definitely related to him.

Although I don't know why, the younger sister whose name is also called "Zhi" still takes her mother's surname even though she was awarded her father by the court, but this will not make Chu Xuan feel too strange.

And if nothing else, the role played by Chu Xuan should have been based on his mother's surname "Ito".

Because if the man named "Ze Yue Zhi" is really the biological father of Chu Xuan's setting, then it can be known from the achievement of "The Pervert Who Likes Close Relatives ~ Annihilation the Most" that he at least has the daughters of Xiyuan Temple World, Qingpu Instant, Ertiao Sisters, Gui Yanye, and Gui Xin Sisters outside, and they all have their mother's surnames.

- Yes, Gui Yanye and Gui Xin sisters also appeared in the two achievements of "Favorite Close Relatives ~ Annihilation Pervert" and "Sister Flower Collector" at the same time, and they have a kinship with Chu Xuan within three generations.

In his investigation of the family status of these "sisters", Chu Xuan found that except for Gui Yanye and Gui Xin, the rest of the people lived alone with their mothers like Chu Xuan, but they were all children born out of wedlock.

The father of a non-biological child is not easy to investigate, so Chu Xuan started with the household registration of Gui Yanye, who was the best to investigate.

In the information database of the civil affairs system, Chu Xuan found that Gui Yanye's father was not Ze Yue Zhi, but Ze Yue Zhizheng.

But this does not rule out that it was Zeyue Zhizheng who stopped Zeyue - and it was a long time, and he actually gave birth to two sisters who were several years apart in age.

However, even if Gui Yanye's biological father is indeed Sawayue Zhizheng, it is still possible that he has a kinship with Chu Xuan within three generations.

According to the legal definition of "close relatives" who cannot marry:

Lineal blood relatives or collateral blood relatives within the third degree of consanguinity are not allowed to marry, except between the adopted child and the collateral blood relatives of the adoptive party.

And the calculation of "affinity", i.e., "algebra", is:

(1) It is determined by calculating the number of lives between relatives.

(2) The kinship of collateral relatives begins with the person whose kinship is calculated or his spouse, and is traced back to the ancestor of the same origin, and then from that ancestor to the other person who calculates the kinship, according to the number of generations in between.

This means that starting from oneself, oneself is the first degree of kinship with one's parents, the second degree of kinship with one's grandparents, the third degree of kinship with one's parents' biological siblings, and the fourth degree of kinship with one's cousins and cousins.

Therefore, marriage is also allowed between cousins and cousins, and the only people who cannot marry are blood relatives.

So, since Chu Xuan's "father" is Ze Yuezhi, in addition to Gui Yanye and Gui Xin's biological fathers are also Ze Yuezhi, they can be counted as close relatives ~ Annihilation, in fact, there is a possible situation......

That is Gui Yanye's biological father, Zeyue Zhizheng, who is a half-brother with Chu Xuan.

In this way, Chu Xuan and his father Ze Yue Zhi are the first degree of kinship, and the other son of his father, Ze Yue Zhi, is the second degree of kinship, and the third degree of kinship is between him and Ze Yue Zhizheng's daughter Gui Yanye.

So in terms of ethical relationship, Chu Xuan and Gui Yanye are uncles and nieces, and they also belong to the category of "close relatives" who cannot get married.

Because of this possible surname, coupled with the two names with the same surname, "Zeyue Zhi" and "Zeyue Zhizheng", Chu Xuan investigated Zeyue Zhizheng's parents in the information database again.

As a result, he found out that Zeyue Zhi was the child born to his father Zhi and Yueba, the daughter of the Zeyue family, who was a big capitalist.

And although Ze Yue Zhi and Ze Yue Ba have the same surname, the two of them are not close relatives, and they are not "of the same clan", they can only be regarded as the same clan.

Dan Zeyue Zhizheng also followed his mother as always, inheriting the name of the Zeyue family on his mother's side, and also inherited the huge fortune of his grandfather, who was a big capitalist.

The time of this marriage was decades ago, so Chu Xuan's "setting" age was the same as Gui Yanye's, both were 1 years old, the first year of high school.

In this way, Chu Xuan's father, Ze Yuezhi, who has never met before, should at least be a middle-aged and elderly uncle in his forties and fifties.

Because of the example of Gui Yanye, Chu Xuan couldn't conclude that the biological fathers of Xiyuan Temple World, Qingpu Zena and the two sisters must be Ze Yue Zhi, and they were also likely to be uncles and nephews with Chu Xuan.

But the mothers of the remaining girls were not registered with their biological fathers at all, so they could not be traced to the household registration system who their fathers were - otherwise they would not have been called "illegitimate daughters".

Although it seemed that who their biological father was had nothing to do with Chu Xuan, he just needed to raid these girls according to the requirements of the achievement task, but in order to verify a certain speculation in his heart, Chu Xuan still invaded the information database of the health system and investigated again.

Fortunately, just like in "White Rabbit Candy", in the maternal and child health manual, the name of their biological father is recorded.

Outcome...... Their biological father turned out to be not Ze Yuezhi, but a man named "Jian Yi".

During the investigation, Chu Xuan found that Jian Xuan was also an illegitimate child, his father was unknown, and his mother was Jian Chuhua.

Moreover, the maternal and child health manual was too old to be entered in the health system's information database at all, so Chu Xuan could not verify who his biological father was.

But if it weren't for Ze Yue stopping the instant, it would be certain that Chu Xuan and the interval were also half-brothers.

Because he was suspicious of Ze Yuezhi and the fact that there were many illegitimate children in this area, Chu Xuan expanded the scope of the investigation a little.

As a result, he discovers that Saionji Tsutoko, the mother of Saionji World, Kiyoura Mai, the mother of Kiyoura Senna, and Nijo Wakaba, the mother of the Nijo sisters, and even Sawanaga Taisuke's father, Ayumi Sawanaga, are also illegitimate children.

Further up from this part, because there is no age, there is not much useful information from the information base of the civil administration and health system.

However, Chu Xuan still found some clues in the information database of the civil affairs system, following their maternal lineage and the old surnames that had changed.

The original name of Saionji Temple was Yi Neng Tsuko, and her mother was Yi Neng Meng Onion.

Kiyoura Mai was originally known as Ino Mai, and her mother was Ino Kagura.

And Ino Kagura is the daughter of Ino Moe Onion.,The sister of Ino Tsuchiko.。

Ze Yongbu's original name was Yi Nengbu, and his mother was Yi Neng Meng Onion.

And Ze Yue Zhi, the original name is Yi Nengzhi, and his mother Ze Yue Taoli, but his father is unknown, and he is also an illegitimate child.

So, under the investigation of the cocoon, the surname "Yineng" surfaced.

But what connections these descendants of the "Yineng" family have with the people around Chu Xuan, and what interpersonal relationships they have, these are not just based on the information that used computers to hack into the civil affairs and health systems.

In the future, Chu Xuan also had to start a difficult field investigation.

He plans to start with another place where there is a more complete archive, that is, the school, and look for clues related to "Ineng", with Ze Yuezhi, and the mothers of those illegitimate children in the old graduate albums.