Uninsured Vehicle accident with RC on Seller's name

Namsate Sir, I need your expert advice on my situation: I have sold my car to buyer 2016. I did the formalities like taking NOC from my city RTO and handed over to buyer and agent. Signed all the required document, challan was put by the agent. The agent prepared the file and kept but never submitted to RTO (as instructed by buyer). As a result car is still in my name. Now there was accident in Nov-2020. where buyer's driver hit motor cycle,. The causalities are : Buyer's driver died, and motorcycle died. In the FIR, buyers has put up forge notrary that seller has sold the car to buyer in Sep-2020. and stated that anything happened after sep-2020 will not be seller's responsibility. With this it looks buyer has accepted that cat has been sold to him (but in RTO it is sill in my name). The buyer has also submitted the car RC. My question: 1) Buyers was also present and injured in the car when accident happened.Also he has given in notrary (though forge signed and the date which i was not in the city) that he will be responsbile for any accident after Sep-2020 (accident happened in Nov-2020). 2) Will i have to pay the compensation to the victim or buyer? 3)With above situation any chance of defense to get away with claimed by accident victims 4) Do i need to pay to Bike owner and all the occupant of the car including Buyer( though he is the actual owner and consent given to driver to drive). Car: Driver (Died), Buyer and 2 more travelers Bike: Rider (Died) and fellow rider(leg broken).