There’s two paths Blondie can take for her siblings. Ignore them and faithfully do what she said she’ll do, by being nonexistent. Or rising in power to either help, laugh, whatever fits her personality at the siblings when they fall in status and “honor”. I personally like option 3 where she kills them by framing certain people and causing scandals. By framing, she’ll get away scot free when she murders, and by creating scandals, people will think negatively on the siblings and will think that they deserved to die.