I (daughter) think I might of signed a waiver of rights to property (ansestor /acquired /or both)

Hi to all: please help; when I turned 18th years old, I used to think my father was such a great man and trusting him Blindly, I listed to him when he took my mother and my brother to the taluk/registrar office and told us three one by one to go inside and sign to a “document” I was such a naive girl I never thought to even read through anything or even the TITLE lines etc. He never explained what it was, but some blurry memory of him saying it’s something about ancestor land etc…he never told what the hell it was. He was a narcissistic man and later many many years I got to realise and finally broke free. So one can imagine the fear of a 18yr old girl constantly mentally abused throughout childhood….how can she dare to think or even ask her father what the hell is she signing and what document etc. So I walked in and did the sign. ****** Infact******, the person(gov employee) standing behind the glass counter with the document clearly asked me “do u know what this is?”, pointing to the document……myself I made the biggest mistake of my life I think…I told him “yes,” and nodded my head and signed and left. I cannot remember if gave a thumb impression also or just a signature. Now I am so worried what that document was and knowing how kind of a horrible man my father is, I wonder if that was a waiver deed… Now I am 30years old and married. Dads ancestor land is being divided amongst his brothers and sisters currently and “few plots” are already “divided” recently within the past 2years and still lots of land pending to be officially divided as the siblings are constantly arguing etc. PLEASE HELP ME TO UNDERSTAND IF THAT DOCUMENT I WAS TRICKED INTO TO SIGNING, was a waiver deed and if so 1.) how to confirm what that document was 2.) if it was a waiver deed, can I do anything about it now on any grounds??? I was not mentally mature.