Immovable property can be legally transferred/conveyed only by way of a deed of conveyance/sale deed which is duly stamped under the provisions of the Stamp Act applicable to the state in which such property is situated, as well as registered under the provisions of the Registration Act, 1908.
Of course, a power of attorney can be granted by the party transferring the property (transferor) to the party to whom the property is to be transferred (transferee) for the purposes of granting authority to the transferee to execute the conveyance/sale deed in favour of the transferee, and registration of the conveyance/sale deed on behalf of the transferor. However, such a power of attorney itself would not grant any right, title or interest in the immovable property in favour of the transferee, and a conveyance/sale deed would be required to be executed, stamped and registered for this purpose.
Registration of power of attorney is optional In India before 2009.But after the Honble Supreme Court vide its judgment rendered in case titled as Suraj Lamp and Pvt. Ltd. v/s State of Haryana and another. The nature, scope and execution are redefined. Compulsory registration is effected from December 2012 on wards.
If a 'Power of Attorney' given to an Indian resident by a NRI from outside India is valid and acceptable by Indian...
STEP 1: Write the power of attorney on plain paper. There is no need to create it on stamp paper from India, subject to conditions. Sign the power of attorney. Two witnesses should also sign this document. The addresses of the applicant and witnesses should be typed clearly. All this must be done in the presence of a notary public. You can also get this done at the Indian Consulate as well.Once your power of attorney is attested by the Indian Consulate/Embassy you can send it to India. and adjudicate the same before collector or district registrar.
(Foreign Power of Attorney should be got stamped by the Collector after its receipt in India within prescribed time of 3 months)
In your case your wife can execute Power of Attorney in favour of her father . you Should execute POA in favour of your family member - blood relative