They're third cousins, so the blood relation is already distant, not to mention their family names are also different... I watched cardcaptor sakura and there's a girl who got a crush on her cousin with the same family name as hers... Idk if it's considered normal in japan or something
I dont care if it's 3rd cousins that ish is still gross. They are family. and yeah japan loves doing that crap (at least in manga, i don't think it's excepted in society but I could be wrong). that's why they have all that " i love my step sister/brother" stuff. it's weird so I don't read'em but at least they aren't blood related.
It was nice to see that they all managed to live together in a better and safer time. Also poor Yushiro...left behind after everyone he knew had died. Hope baby boy is ok. Also.i was hardcore shipping Nezuko and Zenitsu but not so much after reading this. because if they are then this totally showed that Zenitsu's great granddaughter and Tanjiro's great grand son are together....that's just..*gagging*