Cheating my share in ancestral property

How is that the property is ancestral? Whose property?

What do you mean by "It seems both brothers during 2016 cheated my wife, by transferring house in their names."? What is the "transfer" you are referring to?

Please post complete facts, but not your assumptions and presumptions.

Anyhow, no police case lies in a civil dispute.

Property passed down the generations to her father from his father...

My wife found that the house is in the name of her brothers.

She checked in whose name is EB bill and water tax. Found that they are in brothers' name, while she thought it was in their Father's name. My wife did not sign any papers allowing name transfer. Legal heir certificate showing her as one of the legal heirs is available.

Just because property is inherited does not mean that it is ancestral.

So also, name in the EB/Water Bill or even in Revenue or Municipal records does not create, alter or destroy title to property.

I got to know that my wife's Brother's wife has planned to sell house.  Per present situation, EB bill and water tax is in wife's  brothers' names, I assume that the house property could also have been name transferred in their names.  and both of them expired. So there is nothing to prevent my wife's Brother's wife to transfer property in her name for further sale to any party. My wife stays in different city with me.  While only my wife's Brother's wife and her daughter stay in ancestral house.

Base document for this name transfer could be possible only by fraudulent noc signature of my wife, being submitted to registration department, water tax department, EB bill department. Otherwise without my wife consent, how can the name transfer be possible

You may approach a local advocate and proceed with a suit for partition which is the only remedy before you for now.