Not sure if anyone’s done this, but I compiled a list of characters with siblings. I’ll be leaving out the Udagawa and Hikawa sisters in the list. If I missed any characters, let me know!

popipa

Kasumi: younger sister

Saaya: younger brother and sister

Rimi: older sister

Afterglow

Himari: older sister

pasupare

Aya: younger sister

Chisato: younger sister

harohapi

Misaki: younger sister and brother

Hagumi: older brother Edit: so apparently in one of the card stories Hagumi said she also has a sister, but in another, she said she only has a brother. The stories were amended, thus she now only has a brother... R.I.P. Hagumi’s sister

Kanon: older brother