Her family is already ruined from the start. If their family's happiness is sustained from the demise of several people, not to mention the murder of their own flesh and blood, then it's already ruined beyond repair.
Even if they succeeded to keep everything under wraps, they'll just involve innocent people, like Ina when she could've just lived a normal life but now she's damaged as well from her parents' crimes.
Her family is already ruined from the start. If their family's happiness is sustained from the demise of several people, not to mention the murder of their own flesh and blood, then it's already ruined beyond repair.
Even if they succeeded to keep everything under wraps, they'll just involve innocent people, like Ina when she could've just lived a normal life but now she's damaged as well from her parents' crimes.