Demolition of 60 yrs old building

Last year my sister and I did a partition deed for our parental house which is 60years old. After getting all the plan approvals now I am about to demolish and construct new house.The building is on common slab.My brother in law being a quarrelsome person is causing issues and preventing us from demolishing the property.Firstly he said ,building in his part will also collapse,but it didnt happen. Slab was safely separated and no damage happened to other side building.After separating the slab now we are demolishing using proclainer.Now he is creating menace and is not letting the work progress saying that his side walls will now get damaged which is impossible as the slab itself is now separated.He is also demanding us caution deposit of Rs.500000/- which we have to pay to him else he is threating us that he wont let the work progress.What we have to do now? Is there any such caution deposit norm in law??if it is there how much? ours is 21×59 ie.,134 sq yds area in Vijayawada municipal corporation urban area Andhra pradesh.Is there any legal protection to us??What we have to do to stop this and go smoothly with our construction work??