Two years after Tanjiro's family massacre he thought that everyone except him and Nezuko were dead until one day Giyu walked up to him with a kid who was tied up

Tanjiro: Who's that?

Giyu: ...I don't know.

He tossed you at Tanjiro's feet

Tanjiro: Giyu! That's not nice!

Nezuko: ...Mm...hmm...

Nezuko untied you, your eyes looked just like theirs...you looked just like Tanjiro

Tanjiro: Takeo?! Is that you?!

Nezuko: ...Mmph...

They both hugged you, Tanjiro was already crying at that point