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Chloe Miko and Korone are all related.
Ever since Chloe joined Holo she and Miko acted like they've known each other since even before their first collab. And Chloe has hinted in the past at knowing how Miko behaves irl suggesting the 2 know each other outside of Holo eventhough Chloe is not historically part of Miko's clique in Holo.
Also Miko, Ruka and Hinata always make sure not to overlap each other during streams, Miko will even end her streams right before Hinata goes live or soon after Hinata goes live as if trying to help out her younger cousin with a stream funnel.
Miko and Korone also take family emergency breaks around the same time suggesting they share a family member, perhaps Korone's mom is Miko's aunt.