it was soon you keep guard at night around if any demon around since you are an demon slayer and a hashira, you are a sun hashira even your job protecting people from demon. your age was 18 ans as soon you heard a baby crying near tree in forrest, you go search the noise at

Baby tanjiro was stolen from own parents tanjuro kamado and kie kamado, but soon tanjuro and kie had more children was nezuko a second child, takeo third child, hanako and shigeru twin fourth and fifth child and rokuta sixth child middle. But still miss tanjiro

You found a baby at near tree, the baby had red hair and red eyes, it was baby tanjiro new born child, you look around to see if any parents are looking but there no around people at this night, you took baby tanjiro and you going to your own estate

You raised baby tanjiro alone and you adopted baby tanjiro as your own son, you let amane taking care baby tanjiro and amane was kagaya ubuyashiki wife the head of ubuyashiki and the leader of demon hunter slayer