(if you see conflicting ships uh ✨alternate universe✨)
Shuichi is Kyoko and Makoto's child
Byakuya and Gonta are cousins.
Toko has a lot of half siblings (Mikan being one of them)
Kokichi is Celeste and Kyoko's child
Akane is Hina's cousin.
Celeste is Gundam's half sister
Chihiro and Chiaki are half-siblings.
Kaito and Tenko are Mondo and Taka's kids.
Komaru and Makoto are Mahiru's cousin.
Tenko and Kaito are siblings.
Toko and Komaru adopted Nagisa.
Hina and Sakura adopted Masaru.
Celeste and Kyoko adopted Kotoko and Jataro.
Nagito and Hajime adopted Monaca.
Nagito and Sonia are twins.
Tsumugi is Twogami's sister
Rantaro is Monaca's brother.