Can do! To make it brief Tamaki has a younger sister he grew up with in an orphanage. She was adopted separately but her adoptive family went bankrupt and she disappeared w them. Tamaki became an idol to find her and be able to support her financially... a lot of things go on with them in canon that are spoiler territory so I could disclose on plurk or sth but to make it brief they’re separated in their canon universe and she’s his only family.

idol boy drama orphan brother edition basically