When a family owns an inherited house, a piece of land in their country of origin, or a joint bank account, the same question often arises: “Can several siblings grant a single power of attorney so that one of us can represent everyone?”
If you live in the United States and need to handle legal or administrative matters in Latin America together with your siblings, this article explains how a power of attorney among multiple siblings works, the types available, and the steps required to process it correctly.
Important: This content is for informational purposes only and does not replace individualized legal advice from an attorney or legal professional. Each case should be reviewed individually.
What Is a Joint Power of Attorney Between Multiple Siblings?
A power of attorney is a legal document through which a person (or several people) authorizes another individual to act on their behalf and sign documents for them in certain matters.
When we talk about a power of attorney among several siblings, we refer to situations such as:
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Several siblings grant power of attorney to one sibling so that they can represent everyone.
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All siblings appoint each other so that any of them can represent the group.
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The siblings must act together, requiring the participation of more than one person for the power to be used.
It is commonly used when:
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There is an inheritance that must be accepted or distributed.
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A family house owned by multiple siblings is going to be sold.
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Legal documents must be signed in the country of origin, but some siblings live abroad.
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There are joint bank accounts or shared investments.
In simple terms, a power of attorney allows one or more siblings to legally represent the others in a specific matter without requiring everyone to travel or be physically present.
Types of Powers of Attorney Among Siblings
1. General Power of Attorney Between Siblings
A general power of attorney authorizes the agent to act in a wide range of matters, such as:
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Signing contracts
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Representing before banks, notaries, and authorities
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Managing property, collecting rent, paying taxes, etc.
When several siblings grant a general power of attorney to one person, that sibling can handle almost all matters related to shared assets.
Advantage: Very flexible and avoids drafting new powers of attorney for each procedure.
Risk: If not properly limited, the agent may make very broad decisions without always consulting the others.
2. Special Power of Attorney (For a Specific Transaction)
A special power of attorney is drafted for a specific purpose, for example:
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Selling a family house or apartment
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Signing the purchase or sale deed of land
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Accepting an inheritance and signing the distribution agreement
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Handling a specific legal proceeding
In this case, the siblings can clearly state in the document:
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Which property or transaction is authorized
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The minimum sale price
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The notary or authority before which the signing will take place
Advantage: Much more controlled. The agent can only act within the described scope.
Disadvantage: If another transaction arises later, a new power of attorney must be granted.
3. Joint (Mancomunado) Power of Attorney
In a joint power of attorney, the document establishes that the agent may act only with the joint signature of several siblings or with the explicit consent of all of them.
Advantage: Provides greater control and transparency; unilateral decisions are avoided.
Disadvantage: Procedures may become slower, especially if one sibling is abroad, ill, or unavailable.
4. Several (Solidary) Power of Attorney
In a several power of attorney, any of the appointed agents can act independently without the others.
Advantage: Much faster procedures. If one sibling is unavailable, another can sign.
Risk: Requires a very high level of trust and clear internal agreements to avoid conflicts.
5. Power of Attorney Granted to a Third Party
Sometimes, to avoid tension between siblings, the power of attorney is granted to:
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An attorney
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A trusted relative who is not an heir
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An independent professional
The siblings maintain ownership of the assets but delegate management to a neutral person who must follow the written instructions.
Pros and Cons of Authorizing One Sibling vs. Several
When drafting a power of attorney among several siblings, one key decision is:
“Should we grant the power to just one sibling or to several?”
One Sibling as the Main Agent
Advantages:
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Faster procedures (one person signs, coordinates, and responds).
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Fewer logistical problems if the others live in different countries.
Disadvantages:
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It may create mistrust: “they decide everything.”
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Without good communication, others may feel a lack of transparency.
Practical recommendation:
If choosing this option, it is advisable to establish written limits (for example, a minimum sale price) and request periodic reporting from the agent.
Several Siblings as Joint Agents
Advantages:
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Greater sense of fairness: everyone participates.
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Important decisions are made collectively.
Disadvantages:
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Each additional signature adds complexity.
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Disagreements may block important transactions.
Several Siblings as Independent Agents
Advantages:
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Maximum flexibility: whoever is available signs.
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Ideal when there are urgent procedures or siblings in different time zones or countries.
Disadvantages:
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Risk of decisions being made without prior consensus.
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Requires clear internal rules on communication and management of received funds.
Do You Need a Power of Attorney Among Siblings from the United States to Latin America?
We can help you with the drafting and legalization process for your country of origin.
Basic Legal Requirements by State (New York, New Jersey, and Florida)
In the United States, Power of Attorney (POA) rules vary by state. Although specific details should always be reviewed with a professional, in general you should consider the following:
In New York
The document must be signed by the person granting the power, signed before a notary public, and for certain powers may require witnesses and specific formats.
In New Jersey
The power of attorney must be signed and usually notarized. Some types of powers also require witnesses, and it is important to use updated forms.
In Florida
It is common to require the signature of the principal, the presence of two witnesses, and notarization. The text must comply with state law requirements to be valid and accepted by banks, notaries, or courts.
Key advice:
Even if the power of attorney will be used in a Latin American country, if it is signed in New York, New Jersey, or Florida, it must first comply with that state’s rules. Then it must meet the requirements of the destination country (apostille, translation, etc.).
How to Create a Power of Attorney Among Several Siblings from the U.S. for Use in Latin America
If you or your siblings live (or some of them live) in the United States, the process typically follows these steps:
1. Define Exactly What Is Needed
Before going to the notary, it is important that the siblings clarify:
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What procedures need to be completed? Sale, inheritance, banking, legal matters?
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Do we need a general power of attorney or only for a specific property or inheritance?
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Who will be the agent? One sibling, several, or a third party?
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How long should the power of attorney remain valid?
2. Draft the Power of Attorney (Adapted to the Destination Country)
Even though the document is signed in the United States, the content must be acceptable to the notary or authority in the Latin American country where it will be used.
For this reason, it is very helpful to work with a notary or legal office familiar with the destination country’s requirements, include complete details of the property or legal matter, and clearly specify the authorized powers.
3. Signing Before a Notary in the United States
Once the text is reviewed, the siblings granting the power must appear before a notary public in the United States.
Their identities are verified, and they sign the document following the formalities required by the state.
If some siblings are in different cities or countries, separate powers of attorney with the same content can be prepared.
4. Apostille or Legalization
For the document to be valid in most Latin American countries, it usually requires a Hague Apostille or consular legalization.
This step certifies that the signature of the U.S. notary is authentic so that the notary in the destination country can accept it without issues.
5. Sending and Using the Power of Attorney in the Country of Origin
Finally, the apostilled or legalized document is physically sent to the destination country.
The agent presents it to the local notary or authority and, from that moment on, can sign on behalf of all siblings according to the granted authorization.
Frequently Asked Questions
1. What Happens If One Sibling Does Not Want to Sign the Power of Attorney?
A sibling cannot be forced to grant a power of attorney. If one refuses, they cannot be represented in the transaction, and other legal options may need to be considered depending on the property or case.
2. Can a Power of Attorney Be Revoked Even If It Is Already Being Used?
Yes. In most cases, the person who granted the power can revoke it at any time, as long as proper legal steps are followed and the agent and relevant institutions are notified.
3. Is a Power of Attorney Signed in the United States Valid in Latin America?
Usually yes, if it follows the legal requirements where it was signed, has the proper apostille or legalization, and is acceptable under the laws of the destination country.
4. What Should Be Done If There Is Disagreement Among Siblings After Signing the Power?
First, review the power of attorney and clarify communication and decision rules. If the conflict is serious or there is possible misuse, legal advice and revocation of the power should be considered.
5. Do You Need a Power of Attorney Among Several Siblings?
If siblings need to sell property, manage an inheritance, or handle family assets without traveling, a power of attorney can simplify the process. A notary or legal professional can help draft and legalize the document properly.
6. Can two siblings have power of attorney?
Yes, two siblings can have power of attorney. They can be appointed to act together (joint power) or independently (several power), depending on how the document is written. This allows flexibility while still maintaining control over important family matters.
Published on 20 Feb 2026
