The document you need is a Consent Divorce Decree or a Settlement Agreement (often called a Memorandum of Understanding or MoU) that is incorporated into a court decree.
Crucially, a notarized MoU or affidavit, while having some evidential value, is NOT the most secure or legally binding method for this purpose. It can be challenged and repudiated later.
The gold standard is to have this agreement made a part of a final judgment from a family court, which makes it legally enforceable as a decree.
Recommended Legal Strategy & Document
Here is the most secure, step-by-step approach you should take:
Step 1: Draft a Comprehensive Settlement Agreement (MoU)
This will be the core document outlining all terms. It must be drafted meticulously by a lawyer and should include:
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Parties: Full details of you, your husband, and your minor son.
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Background: A brief recital of the marriage and the mutual decision to settle matters amicably.
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Terms of Settlement:
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Transfer of House: Exact details of the property (address, survey no., etc.), a clear statement that it will be transferred to your name free of all encumbrances, and a specific timeline for the execution of the sale deed/gift deed and registration (e.g., within 30 days).
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Lump Sum Alimony: The exact amount, mode of payment (cheque/RTGS), and date of payment.
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Monthly Maintenance: The amount for you and your son, the due date each month, and the mode of payment. Specify until when this will continue (e.g., for you until your remarriage or lifetime; for your son until he becomes a major/self-supporting).
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Child Custody: Clearly state that you will have physical custody of your 17-year-old son. Specify visitation rights for your husband, if any.
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Mutual Divorce: A clause stating that both parties will file a joint petition for mutual divorce under Section 13-B of the Hindu Marriage Act, 1955 (or the relevant law applicable to you) and that this settlement agreement will be made a part of the divorce decree.
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Residence Arrangement: Explicitly state the temporary arrangement that your husband is permitted to reside in the house only until the registration of the property in your name is complete. Specify a "move-out date" to avoid future confusion.
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Full and Final Settlement: A critical clause stating that this agreement is in full and final settlement of all your past, present, and future claims against your husband (maintenance, property, etc.).
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Signatures: Both parties must sign every page.
Step 2: File for Mutual Consent Divorce Simultaneously
Do not wait. Alongside drafting the MoU, you and your husband should file a joint petition for divorce in the relevant family court. This process has a mandatory cooling-off period of 6 months to 18 months.
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First Motion: You file the petition and record your statements before the court. You also submit the signed Settlement Agreement to the court.
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The Court's Role: The judge will examine the agreement to ensure it is fair and voluntary, especially concerning the welfare of your minor son.
Step 3: Get the Agreement "Recorded" by the Court
This is the most important step. You will request the court to formally "record" the terms of your Settlement Agreement and pass an order in these terms. This interim order, even before the final divorce decree, will give the agreement the teeth of a court order.
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Why this is vital: If your husband violates the terms (e.g., delays property transfer, stops maintenance), you can file for enforcement of the court order immediately, which is a much faster and stronger legal remedy than suing on the basis of a breach of a notarized MoU.
Step 4: Final Hearing and Decree
After the mandatory cooling-off period, you appear for the second motion. The court, being satisfied, will grant the final divorce decree and make your settlement agreement a part of the decree. This makes it absolutely binding and enforceable.
What About the Temporary Living Arrangement?
Your concern about him moving back in is valid. The Settlement Agreement filed in court should explicitly state the temporary living terms:
"The Husband shall be permitted to reside at the said property located at [Full Address] until the execution and registration of the Sale Deed/Gift Deed in favor of the Wife, which shall be completed on or before [Specific Date]. The Husband hereby undertakes to vacate the premises peacefully on or before the said date and hand over vacant and peaceful possession to the Wife."
Having this clause in a court-recorded agreement prevents him from claiming any right to stay indefinitely.
Summary: What to Do Now
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Immediately Consult a Family Lawyer: Do not rely on templates. Your situation is complex and requires professional drafting.
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Instruct Your Lawyer: Your goal is a Settlement Agreement that will be filed in court alongside a Mutual Consent Divorce Petition.
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Do NOT Settle for a Notarized Document Alone: A notarized MoU is better than nothing, but it is a weak document compared to a court order. Treat it only as a preliminary step if you must, with the immediate next step being court filing.
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Protect Your Proof: Keep all the evidence of the affair safe and provide copies to your lawyer. This is your leverage to ensure he agrees to a fair settlement and does not back out of the mutual consent process.
By taking this route, you transform a private agreement into a powerful court decree, ensuring that the transfer of the house, the payment of money, and all other terms are legally binding and enforceable, giving you and your son the security you deserve.