Arjun Singh (Manager) 01 November 2012
Tajobsindia (Senior Partner ) 02 November 2012
1. If you want to disown your sister then, you give her a notice about it and also publish a notice in a local newspaper of your intention to disown your sister and now you've no relationship with her.
However there is no law that formalizes it. You simply stop talking to her, and specifically deny her any inheritance in your registered will.