Non -registration will not affect validity of will. In India depending on location, there is a further requirement to approach court and obtain probate without which the will may not be enforceable.

It is better in your own interest to collect all the documents from the seller and consult a lawyer before registering the sale deed in order to to it the way that protects your interest completely or substantially at the least.

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As per section 213 of the Indian Succession Act otaining probate is required for the legal enforcement of the will in your case specially when the property is at Chennai{Madras]. Other aspects relating to the title should be checked by competent legal expert.-----------Mahendra Bhavsar--www.mahendrabhavsar.com