challenging of will deed

What is the ground for challenging the will ?

One has to file declaration suit and establish such fraud /undue influence and it will be a long struggle to establish undue influence and convince the court.   Contact local advocate as presumptions/assumptions are not permissible in establishing undue influence and there must be solid proof like establishing a criminal charge.

 will irrespective of its registration can be challenged on the following grounds,

• Fraud
• Coercion
• Undue influence
• Suspicious nature
• Lack of due execution
• Lack of testamentary intention
• Lack of testamentary capacity
• Lack of knowledge and approval
• Forgery
• Revocation

Please post the complete facts bringing out the real issue. Wild and vague allegations are insufficient for making any meaningful suggestion.