India/Maharashtra: How can my family protect ourselves from false implication if my father does case for his protection and what if we something happens/ dies unexpectedly or suspiciously? Need legal advice.

I need genuine legal advice regarding a serious family situation.
There has been an ongoing dispute between my father and our family (my mother, my brother, my maternal uncle and me). In December 2025, my father made a police complaint against all four of us. There have also been incidents where he threatened us, and we have video/electronic evidence documenting some of his behaviour and our interactions.
We did not initially make a counter-complaint because he is our father and we were trying to avoid escalating the situation. However, we are now concerned about protecting ourselves legally.
My father has made statements suggesting that if anything happens to him, responsibility/blame should be placed on us. We are worried because there is also significant hostility between my father’s side of the family and my mother’s side.
My main concern is this:
If my father unfortunately dies in the future due to an accident, suicide/self-harm, medical reasons, poisoning, or any other unexpected/unexplained cause, could my mother, brother, maternal uncle or I automatically become suspects or face criminal proceedings simply because we are family members or because my mother normally prepares food at home?
I understand that in a suspicious death, police may conduct an investigation, post-mortem and forensic examination. I want to understand how innocent family members can protect themselves from a false accusation.
My questions:
What evidence would normally be required before a family member could be accused of intentionally causing someone’s death?
Is merely preparing or serving food enough to establish criminal liability?
If there is a history of threats or statements made by the deceased blaming family members in advance, how should we legally document and preserve those statements?
What preventive legal steps can my family take right now to protect ourselves from a future false implication?
Should we make a written preventive representation/information to the police, approach a senior police officer, or consult a lawyer?
If the death is ultimately determined to be suicide, accident, or natural/medical causes, under what circumstances could family members still face criminal proceedings?
What evidence should we preserve now — videos, messages, CCTV, witnesses, previous police complaints, medical records, etc. — and how should electronic evidence be preserved so that it remains legally useful?
We have very limited financial resources and cannot easily afford a private advocate. What free or low-cost legal assistance is available in Maharashtra? Can we approach the District Legal Services Authority (DLSA) or another legal-aid service?
Since my father has already made a police complaint against us, what steps should we take to understand our legal position and protect ourselves without unnecessarily escalating the family dispute?
There is also a concern that someone on my father’s side has connections with a local politician. I don’t know whether this would actually affect the legal process, but it is one of the reasons we are worried about taking proper preventive legal steps.
We have evidence documenting how my father has behaved toward us and how we have behaved toward him. We do not want to manipulate or fabricate anything; we simply want to preserve genuine evidence properly.
I am not asking how to harm anyone or how to cause poisoning/death. I only want to understand what legal precautions an innocent family can take in advance if there is a genuine fear of false implication.
Please answer specifically from the perspective of Indian criminal law and procedure (BNS, BNSS, BSA and relevant Maharashtra procedure), especially regarding preventive measures and legal aid.
I would really appreciate advice from qualified Indian lawyers, law students, or people with genuine experience with criminal/forensic procedure.
Thank you .