Later it is revealed that he married fellow slayer Kanao Tsuyuri. In the Modern World, Tanjiro and Kanao had descendants named Sumihiko Kamado and Kanata Kamado.
Despite looking very similar and having the same unique colored hair, Tanjiro is not related to Yoriichi through blood. Hundreds of years ago, when Yoriichi was alive, he came across one of Tanjiro's ancestors, who was being attacked by a demon.
Yoshiteru Agatsuma ( 我 あが 妻 つま 善 よし 照 てる , Agatsuma Yoshiteru?) is the great-grandson of Zenitsu Agatsuma and Nezuko Kamado and the younger brother of Toko Agatsuma, who is a teenage student.
Tanjuro Kamado a recurring flashback hero from Demon Slayer : Kimetsu No Yaiba. He was the husband of Kie Kamado, and the father of Tanjiro, Nezuko, Takeo, Hanako, Shigeru, and Rokuta. Tanjuro was a flame dancer who used to dance the Hinokami Kagura during the winter.
Kanata Kamado ( 竈門 かまど カナタ, Kamado Kanata?) is the great-great-grandson of Tanjiro Kamado and Kanao Tsuyuri, and the older brother of Sumihiko Kamado.
Tanjiro's connection to Yoriichi is not through blood relation, but through their similar appearances, which is due to the divine nature of Sun Breathing. (Also Read: Did Demon Slayer hire a Bollywood director for Season 3? Fans speculate!)
Nezuko marries Zenitsu Agatsuma in the Demon Slayer series.
Thanks to Somiyoshi, and later on Tanjuro who passed it down to Tanjiro, the world is left with a weapon to defeat Muzan Kibutsuji, long after Yoriichi passed away. Those are ultimately the role of Tanjiro's father, Tanjuro Kamado, in the story of the Demon Slayer.
In Demon Slayer: Kimetsu no Yaiba. The protagonist of Demon Slayer, Tanjiro Kamado is the oldest son of a late charcoal-seller, Tanjuro. In the first chapter of the manga, his family is massacred by a demon named Muzan Kibutsuji, with only his sister Nezuko Kamado surviving only to become a demon.
Moreover, Tanjiro's appearance somewhat resembled Tsugikuni. So the only reason Muzan is afraid of Tanjiro is because of the Hanafuda earrings he possesses, which acted as a reminder of his downfall.
After his treachery, Kaigaku later becomes Zenitsu's archenemy. His cowardice would later lead him to his downfall when Zenitsu overcomes his insecurities as Kaigaku mocks Jigoro. Kaigaku's Thunder Breathing training would lead to his Blood Demon Arts being related to lightning.
Tengen has a reincarnation/descendant named Tenma, an Olympic gymnastics athlete. The Tokito brothers are reincarnated as young twins.
Who is Jigoro Kuwajima? Jigoro was a former Hashira who practiced Thunder Breathing, which ended up giving him the title of "Roaring Hashira". Naturally, he was a very powerful demon slayer who successfully killed many demons.
Some of the characters who have faced Yoriichi and survived
This happened due to a treatment that had gone wrong. While he was being treated, Muzan killed the doctor because he was not able to observe any results.
Is upper rank one Tanjiro's father? No, they are not related. Tanjiro, by PURE COINCIDENCE, heavily resembles Yoriichi Tsugikuni, the creator of Breath swordsmanship, the only other person to use Sun Breathing, and the only person Muzan ever feared.
Tanjiro's ancestor was a good friend of Yoriichi and arguably was one of his only true friends. Therefore Yoriichi gave the earrings as a gift, and since then they have been passed down the generations until they reached Tanjiro.
Muzan refused to die and when he was finally about to breathe his last, he transferred all the blood to Tanjiro in the hope that he would become the successor and carry out his will.
Muzan Kibutsuji has done some terrible things in Demon Slayer, but his slaughter of Tanjiro's family is one of the most mysterious.
As Muzan begins to disintegrate, he becomes so overwhelmed with emotion that he decides to pass on his dream to Tanjiro. After realizing his abilities to use the Sun Breathing, Muzan decides that Tanjiro is capable of surviving to make his dream come true, and become the King of Demons.
Before he is able to regenerate fully, Tamayo appears and uses her Blood Demon Art to keep him in place, while using a drug that can turn him into human. Using this opportunity, Gyomei Himejima appears and destroys Muzan's head. However he is able to instantly regrow his head.
The only reason why Muzan hates Doma is because of his insincerity and lack of emotions. This might sound odd, expecting emotions from a demon, but even a demon has to retain such tendencies to keep things in order.
Since he didn't know anything about the Blue Spider Lily medicine, he needed others to find the plant for him by happenstance. This is the general reason why Muzan turned Nezuko into a demon. More specifically though, was the fact that Nezuko was of Kamado blood.
Zenitsu's debt is estimated to be around 600,000 yen in modern currency. This massive amount of debt likely came from his 7 ex-girlfriends. Despite all of them being beautiful, they treated Zenitsu like a slave, tricked him as well as robbing him of his money.
It is confirmed in the Volume 23 extras that Inosuke and Aoi did eventually end up together and that they have two great-grandsons, one of which is Aoba.
Eventually Zenitsu and Nezuko would marry and start a family as evidenced by their descendants.