1) you have not mentioned complete facts of your case .
2) who is the owner of the property ?
3) file an RTi application to find out how name of your sisters were added .
4) mere mutation does not confer ownership rights on the property .
5) for demolition and construction of building it is necessary that mincipal corporation sanction building plans submitted by the owner .
6) you can file RTI application to find out on what basis plans were sanctioned .
7) contact a local lawyer