@rap20058,
It sounds like you're still in school - is that so? Is there a counsellor you can talk to there?
Does your country/state/province have a Crisis Line you can call?
Your family needs help and there are resources and options out there. Perhaps a homemaker can come in for a bit. Counselling for your parents. Removing the younger ones to a more stable environment.
Please call someone. No one here can do anything.