Family and property law

Hello sir/madam, I am Pankaj Haloi. I am a govt employee and my mother is also a govt employee.she earns 60k monthly.my parents got married more than 35 years ago.recently my father gave our whole property to a builder.and I saw in their agreement a power of attorney given to the builder to build flat.he dint ask us even a single word and he did that bad thing.my mother have never agreed .and we have a house in our property which was jointly built by my parents I.e they both took loan.bt the fact is that the entire house is built by my mother.and she doesnot want to leave that house.my father is having an illegal affair with a honey trapping typ girl.bt we don't have much proof.bt everyone knows about their affair.my main question is that will my mother get any part of the property? The builder is a very rich person.my father is physically and mentally harrasing her a lot daily.and I work little far from my home town.she as an Indian wife is totally broken and she is unable to take any correct decision.please do help me