In some circumstances witnessing the will is not valid. As per the Indian Succession Act, an inheritor mentioned in the will or his or her wife or husband cannot be a witness to the will. However, a Will witnessed by an inheritor mentioned in the Will would continue to be valid. Except the property would not pass on to the inheritor witnessing the Will. Hence, it is important that any person mentioned as an inheritor or beneficiary in a will he cannot witness the will. In the other circumstances any one can witness the WILL.