List of sibling members
The list contains Group48 members who have older/younger/twin sisters who also was or ever be Group48 member.
Notes: (older sister)-(younger sister)
AKB48 members
NMB48 members
- Jonishi Kei - Jonishi Rei
- Yamada Nana (former) - Yamada Suzu
Different Group members
- Nomura Nao (AKB48) - Nomura Miyo (SKE48)
- Takada Ayana (AKB48) - Takada Shiori (SKE48) (both former)
JKT48 members
- Melody Nurramdhani Laksani - Frieska Anastasia Laksani
- Stella Cornelia (former) - Sonia Natalia
- Shinta Naomi - Sinka Juliani
- Hasyakyla Utami Kusumawardhani - Adhisty Zara