Let me know if there's mistakes, I had to rush these two chapters because the sheer lateness. Hope you'll still keep reading!
Page 5, Tsubasa says "Kanata has been so clingy to her big sis", but since she's talking about her brother, it should be "his big sis".
also, niino is a boy, so no need for "them"
Tsubasa doesn't know Niino is a boy, and the Japanese sentence almost certainly didn't include a gender. So for the later reveal to make sense, in English we have to use the ambiguous "them" so it makes sense Tsubasa still doesn't know Niino is a guy.
Though that sentence could potentially be shortened, by dropping the last two words, so it would read better and keep the ambiguity. "Niino grew up abroad where this is normal."