As the property is in the sole name of your wife, she only can give a PoA to her sister. You do not have any title or ownership of the property. Your wife can get a PoA drafted suitably by a competent lawyer, get it either notarised or attested by the Indian Consulate abroad and send it to her sister. It has to be then adjudicated at the land registry in India within 3 months of arrival here. Once the adjudication is done, your sister-in-law can legally act on it.

If property is on wife name she can execute POA in favour of her sister 

the question of husband giving POA does not arise as he is not owner of property 

Yes, both the husband and the wife can execute a Power of Attorney (PoA) in favour of the wife’s sister, even if the immovable property stands solely in the name of the wife. Under Indian law, a PoA is governed primarily by the provisions of the Powers of Attorney Act, 1882, which allows any competent person to authorize another person (called an “attorney” or “agent”) to act on their behalf. Since the wife is the sole owner of the property, she has full legal authority to grant a PoA empowering her sister to manage, maintain, lease, or even deal with the property subject to the powers expressly mentioned in the document.

If the husband also wishes to authorize the same person for matters relating to joint affairs (for example, dealing with banks, signing documents, representing them before authorities, or assisting in property management), he may independently execute a PoA in favour of the wife’s sister as well. The execution of a PoA must comply with the requirements of the Registration Act, 1908, especially where the PoA authorizes actions relating to immovable property such as sale, transfer, or registration. In such cases, registration of the PoA before the Sub-Registrar is generally required to give it legal validity.

Since both husband and wife are residing outside India, the PoA may be executed before the Indian Consulate/Embassy in the country of residence or before a local notary and then duly apostilled/consularized, after which it must be stamped and adjudicated in India under the Indian Stamp Act, 1899 within the prescribed time after receipt. Once these formalities are completed, the wife’s sister can legally act as their attorney in India for the purposes specified in the Power of Attorney document.

POA Act can be accessed online on India Code.

If the intention is to transact including registration purposes for the property in behalf of the property owner then the sole owner i.e., your wife alone can give power of attorney deed in favour of her sister. There's no reason for you to give power of attorney to your sister in law with respect to the property owned solely by your wife because you don't have any rights in the property.

Therefore your wife alone has to authorise her power agent to act on her behalf to carry out the tasks assigned through the power deed.

Yes, both husband and wife may execute a Power of Attorney (PoA) in favour of the wife’s sister even if the property stands solely in the wife’s name. However, the legal necessity and scope depend on what authority is intended to be given.

The governing law for powers of attorney in India is the Powers of Attorney Act, 1882.

1. Whether a wife can give Power of Attorney to her sister

Yes. The owner of the property is fully entitled to appoint an agent to act on her behalf.

Under Section 1A of the Powers of Attorney Act, 1882, a person may empower another person to act as her agent for specified acts such as:

• Managing the property
• Executing documents
• Collecting rent
• Representing before authorities
• Signing sale/lease deeds (if specifically authorised)

Therefore, the wife, being the sole owner, can validly execute a Special or General Power of Attorney in favour of her sister.

2. Whether the husband also needs to give Power of Attorney

Legally, the husband’s PoA is not required if:

• The property is exclusively in the wife's name, and
• The husband has no ownership interest in it.

However, in practice some people still execute joint PoA documents (husband and wife together) when:

• Both are living abroad and want the same person to handle their affairs in India; or
• The attorney will handle other matters such as bank work, tax matters, society dealings etc.

But strictly for property owned only by the wife, only the wife's PoA is legally relevant.

3. If the Power of Attorney is executed outside India

Since both are abroad, the PoA must comply with Indian legal requirements:

• It should be signed before the Indian Consulate / Embassy, or
• Executed before a notary public in the foreign country and then apostilled (depending on the country).

After it reaches India:

• It must be adjudicated / stamped under the applicable Stamp Act of the State within the prescribed time (usually 3 months).

Stamping requirements are governed by the Indian Stamp Act, 1899 and the relevant state stamp rules.

4. If the PoA is intended for sale of property

An important legal principle established by the Suraj Lamp & Industries Pvt Ltd v State of Haryana (2011) is that:

• Property cannot be transferred through PoA itself.
• However, a registered sale deed executed by an attorney on behalf of the owner is valid if the PoA specifically authorises it.

Therefore:

• The PoA must contain specific authority to sell, if sale is intended.
• The PoA itself should preferably be registered in India before being used for property transactions.

5. Practical structure commonly used

In similar situations, the following is typically done:

• The wife executes a Special Power of Attorney in favour of her sister for the specific property.
• The PoA authorises acts such as managing the property, signing agreements, appearing before registrar, etc.
• The document is consulate-attested / apostilled, then stamped and registered in India.

6. Summary

• Yes, the wife can legally give PoA to her sister.
• Husband’s PoA is not necessary for property solely owned by the wife.
• The PoA executed abroad must be consulate-attested or apostilled and stamped in India.
• For sale transactions, the PoA must give specific authority and preferably be registered.

If you want, I can also explain the exact drafting clauses normally included in a property Power of Attorney executed by NRIs, which helps avoid rejection by sub-registrars in India.

Yes 

If the property is under the sole name of wife then wife alone can execute POA. Her husband has got nothing to do in this.

The sister of wife can be a Constituted Attorney. 

When the property is solely on wife's name,  she can give power of attorney to her sister, to act on her behalf. The need for the husband to give power of attorney to anyone, including to his wife's sister does not arise. 

Yes

Yes, a Power of Attorney (POA) can be executed in this situation, but with an important clarification.
Since the property is solely in the wife’s name, legally only the wife (as owner) needs to execute the Power of Attorney in favour of her sister. The husband does not have any ownership rights in that property, so his POA is not legally required for dealing with that property.
However, if both husband and wife want to authorize the sister for other matters (banking, representation, personal matters, etc.), then both can jointly execute a POA for those purposes.
Legal Position
Under the Powers of Attorney Act, 1882:
A POA can be granted by any person competent to contract.
The authority flows only from the person who has legal rights in the subject matter.
Therefore:
For property transactions → only the owner (wife) must execute POA
Husband’s POA has no effect on that property unless he has legal interest
If both are abroad
POA can be executed before the Indian Embassy/Consulate or notarized abroad
It must be adjudicated/stamped in India (as per State Stamp Act) after arrival
Registration is advisable (and mandatory in many states for property transactions)
Practical Advice
Execute a Special Power of Attorney (SPA) clearly specifying powers (sale, lease, registration, etc.)
Avoid very wide/general POA unless necessary
Summary
Wife alone is sufficient for property POA
Husband can join only if authorizing for other matters
POA must comply with stamping/registration requirements in India
If you want, I can draft a legally safe SPA format for NRI execution.

Dear client

Both a husband and a wife can give their wife’s sister a Power of Attorney (POA) even if the property is in the name of the wife only. The POA is regulated by The Powers of Attorney Act, 1882 which allows a person to appoint another as the Agent or Attorney to act on behalf of the First Person for all of the legal rights pertaining to Real Property. Since the property is in the name of the wife only, the wife may grant All Authority to manage, lease, sale, or otherwise deal with said property without any involvement by the husband legally. The husband cannot legally own the property if his name is not on the title of the property. Therefore, the husband may sign a Power of Attorney (POA) to give authority to the wife's sister for all legal rights to the Property, but if the POA is executed in another country, it will need to be executed before an Indian Embassy or Consulate or notarized by Canadian and/or executed in accordance with other Canadian laws, and then stamped or authenticated in accordance with the Indian Stamp Act of 1899 before it can have legal effect. Therefore, the husband's signing of a Power of Attorney (POA) for his wife's sister is not necessary to give his wife authority to sign on behalf of the husband if they want to jointly execute a Power of Attorney (POA) for any other matter, including all matters related to banking, legal matters, or all other real estate.

If you have any query please feel free to contact us

In the present case, the POA from wife is sufficient since the property is solely on her name. 

Yes, both can give a Power of Attorney (PoA) to the wife's sister, though the husband's execution is legally necessary only if he holds an ownership interest in the property. Since the property is solely in the wife's name, she alone must execute the PoA under the Powers of Attorney Act, 1882 . For any property-related transaction, the PoA should be registered under the Registration Act, 1908 to be valid . As you reside abroad, execute it before the Indian Consulate or a notary, then ensure it is stamped and adjudicated in India within three months of receipt .