How to Adopt an Adult in New Mexico
Reviewed by DocDraft Legal Team · New Mexico · Last updated November 13, 2026
New Mexico makes the adult being adopted sign their consent in front of a judge, after a judge or their own independent lawyer has explained what the adoption means, and that signature cannot be taken back unless the court finds it was obtained by fraud. Adult adoption here is a district court proceeding that permanently makes one adult the legal parent of another adult, with the inheritance and next of kin consequences that follow. It runs under its own statute, the Adult Adoption Act, NMSA 1978 40-14-1 to 40-14-15, separate from the rules for minors. Eligibility is open: any adult, meaning anyone 18 or older, may be adopted, and the Act sets no category list and no minimum age gap. The person adopting must be a New Mexico resident, which the Act defines as six months of living in the state immediately before filing or a domicile established with the intent to stay. A married petitioner may adopt without the spouse joining only if that spouse is the adoptee's parent, the two are legally separated, or the court excuses it. The Act asks no one else for consent, apart from a person legally authorized to consent for an adoptee who is incapacitated. Instead, the petition is served on the adoptee's parents, the adoptee's spouse, any guardian or conservator, and a petitioner's spouse who has not joined, and each has 20 days to respond if contesting. The judge holds a hearing, requires clear and convincing evidence, and cannot grant the decree until 30 days after filing. Attorney review of your documents is available through DocDraft.
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Who can be adopted as an adult in New Mexico?
Any adult may be adopted under NMSA 40-14-5(A), and the Adult Adoption Act defines an adult as anyone 18 years of age or older (40-14-2(B)). The Act sets no relationship category, no disability condition and no minimum age difference between the person adopting and the person being adopted.
Does the person adopting have to live in New Mexico?
Yes. Only residents may adopt under NMSA 40-14-5(B). A resident is someone who lived in New Mexico for at least six months immediately before filing, or who has become domiciled here by establishing legal residence with the intention of maintaining it indefinitely (40-14-2(G)).
Does a spouse have to consent to an adult adoption in New Mexico?
No spouse gives consent. A married petitioner may adopt without the spouse joining only if that spouse is the adoptee's parent, the two are legally separated, or the court excuses the failure to join for reasonable circumstances (40-14-5(B)(2)). The adoptee's spouse and a non-joining petitioner's spouse are served with the petition (40-14-9(A)).
Can the adoptee withdraw consent after signing it in New Mexico?
Only in a narrow case. Before the decree, consent may be withdrawn only if the court finds, after notice and an opportunity to be heard, that it was obtained by fraud. After the decree it can never be withdrawn (NMSA 40-14-6(G)). The signed consent must itself state that it cannot be withdrawn.
New Mexico adult adoption at a glance
An adult adoption in New Mexico is a district court decree after which the adoptee and the petitioner hold the legal relation of parent and child as if the adoptee were the petitioner's biological child, including inheritance from and through each other (NMSA 40-14-13). Any adult may be adopted. What sets New Mexico apart is the consent itself. It must be in writing, signed before and approved by a judge in the place where the adoptee or the petitioner lives, and it must state that the adoptee was advised of the legal consequences by independent legal counsel or a judge. It must also say it cannot be withdrawn, and the Act permits withdrawal before the decree only on a finding of fraud. The petitioner must be a resident, and the adoptee's parents and spouse receive notice rather than a veto.
A Las Cruces petition with the consent signed in another courtroom
Graciela has taught school in Las Cruces for twenty two years, and Mateo, 29, the former student she took under her wing when he was 22, now lives out of state and wants her recorded as his mother. Graciela is the resident, so she files in her own county. Mateo signs his consent before a judge where he lives, who approves it after a lawyer explains its legal consequences. Graciela's husband joins the petition. Mateo's birth mother and his wife are each served by certified mail and have 20 days to respond. The hearing comes at least 30 days after filing, and the judge may excuse Mateo's attendance for burdensome travel. The decree gives him the name they agreed on. One gap remains: a trust written by Graciela's own mother for her grandchildren may not include Mateo, since Graciela never acted as his parent before he turned 18.
Relevant Laws
NMSA 1978 40-14-5 and 40-14-6 (who may adopt and be adopted; consent)
Section 40-14-5 lets any adult be adopted, limits petitioners to residents and sets the three cases in which a married adult may adopt without the spouse joining. Section 40-14-6 requires the adoptee's written consent, signed before and approved by a judge, and bars withdrawal except for fraud before the decree.
NMSA 1978 40-14-2, 40-14-4 and 40-14-9 (definitions, venue and notice)
Defines an adult as 18 or older and a resident as six months in the state or an established domicile, places venue in the petitioner's or adoptee's county, and lists who must be served, with 20 days to respond if contesting.
NMSA 1978 40-14-12 to 40-14-14 (hearing, decree, name and birth certificate)
Requires a hearing and proof by clear and convincing evidence, at least 30 days after filing, with the decree entered within six months. The decree carries the new name and full inheritance from and through each party, and a birth certificate application follows within 30 days.
NMSA 1978 45-2-705(F) (class gifts in another person's will or trust)
In an instrument by someone other than the adoptive parent, an adoptee counts as the adoptive parent's child only if adopted before 18, or the adoptive parent was a stepparent or foster parent, or functioned as a parent before the adoptee turned 18.
NMSA 1978 34-6-40 (district court docket fee)
Sets the fee district court clerks collect for docketing civil matters, with a separate figure where the domestic relations mediation surcharge under 40-12-6 is also collected. Confirm with the clerk which amount applies to your adoption petition.
Regional Variances
New Mexico adult adoption rules at a glance
Governing statute
The Adult Adoption Act, NMSA 1978 40-14-1 to 40-14-15. The Children's Code adoption article covers minors, and its own cross reference points adult adoptions to this Act.
Who may be adopted
Any adult (40-14-5(A)), meaning any individual 18 years of age or older (40-14-2(B)). No category list, no relationship test and no disability condition.
Age relationship
None. The Act sets no minimum number of years between the parties and does not require the adoptee to be younger.
Consent of the adoptee
Required in writing, signed before and approved by a judge where the adoptee or petitioner resides, after advice from independent legal counsel or a judge. A legally authorized person consents for an adoptee who is incapacitated (40-14-6).
Withdrawing consent
Before the decree, only on a court finding of fraud after notice and an opportunity to be heard. Never after the decree (40-14-6(G)).
Petitioner's spouse
A married adult may adopt without the spouse joining only if the spouse is the adoptee's parent, the two are legally separated, or the court excuses it (40-14-5(B)(2)). A non-joining spouse is served (40-14-9(A)(4)).
Adoptee's spouse
Notice only. The adoptee's spouse is served with the petition (40-14-9(A)(5)); the consent section asks for no consent from that spouse.
Birth parents
Notice only. The adoptee's parents and the surviving parent of a deceased parent are served, unless they waive it in writing (40-14-9(A), (E)).
Court and venue
District court, with original jurisdiction (40-14-3). File in any county where a petitioner or the adoptee resides; the court may transfer an inconvenient case (40-14-4).
Residency
The petitioner must be a resident: six months living in New Mexico immediately before filing, or a domicile established with intent to keep it indefinitely (40-14-2(G), 40-14-5(B)).
Filing fee
District court docket fee under NMSA 34-6-40, with a different figure where the 40-12-6 domestic relations mediation surcharge is collected. Confirm the total with the clerk.
Home study and investigation
None in the Act. The court may order counseling (40-14-6(F)) and may appoint an attorney for an incompetent adoptee, with the cost assessed against the parties (40-14-11).
Timing
20 days to respond after service (40-14-9(B)); decree no sooner than 30 days after filing (40-14-12(C)(4)) and within six months of filing (40-14-12(G)); no attack on the decree after one year (40-14-12(H)).
Name change
Yes. The adoptee takes a name agreed with the petitioner and approved by the court, and the decree states it (40-14-12(F), 40-14-13(A)).
Inheritance
Full, from and through each party (40-14-13(B)). Class gifts by another transferor reach an adult adoptee only in the cases listed in 45-2-705(F).
Suggested Compliance Checklist
Document your New Mexico residency
Before filing days after startingGather proof that you lived in New Mexico for at least six months immediately before filing, or that you established a domicile here intending to stay (40-14-2(G)). The petition must allege your place and duration of residence (40-14-7(A)).
Decide whether your spouse joins the petition
Before drafting days after startingIf married, confirm whether your spouse will join, or whether one of the 40-14-5(B)(2) cases applies: the spouse is the adoptee's parent, you are legally separated, or the court excuses it. A non-joining spouse must be served.
Prepare the adoptee's consent
Before the hearing days after startingDraft a written consent with the seven statements 40-14-6(B) requires, then have the adoptee sign it before a judge who approves it where the adoptee or you reside. Attorney review of the consent is available through DocDraft.
Draft the verified petition
Before filing days after startingAllege all twelve matters in 40-14-7, including the proposed new name, the reason for the adoption, the adoptee's living parents and children, and why the adoption serves you, the adoptee and the public.
File in district court and serve notice
At filing days after startingFile in the district court for your county or the adoptee's (40-14-4), pay the docket fee the clerk confirms, and serve everyone listed in 40-14-9(A). File the consent and proof of service before the hearing.
Attend the hearing
At least 30 days after filing days after startingBoth of you attend unless excused for good cause (40-14-12(A)). Be ready to prove each allegation by clear and convincing evidence. The decree is to be entered within six months of filing (40-14-12(G)).
Submit the birth certificate application
Within 30 days after the decree days after startingPrepare an application for a birth certificate in the adoptee's new name showing you as the parent, and give it to the court clerk to forward (40-14-14(A)).
| Task | Description | Document | Days after starting |
|---|---|---|---|
| Document your New Mexico residency | Gather proof that you lived in New Mexico for at least six months immediately before filing, or that you established a domicile here intending to stay (40-14-2(G)). The petition must allege your place and duration of residence (40-14-7(A)). | - | Before filing |
| Decide whether your spouse joins the petition | If married, confirm whether your spouse will join, or whether one of the 40-14-5(B)(2) cases applies: the spouse is the adoptee's parent, you are legally separated, or the court excuses it. A non-joining spouse must be served. | - | Before drafting |
| Prepare the adoptee's consent | Draft a written consent with the seven statements 40-14-6(B) requires, then have the adoptee sign it before a judge who approves it where the adoptee or you reside. Attorney review of the consent is available through DocDraft. | - | Before the hearing |
| Draft the verified petition | Allege all twelve matters in 40-14-7, including the proposed new name, the reason for the adoption, the adoptee's living parents and children, and why the adoption serves you, the adoptee and the public. | - | Before filing |
| File in district court and serve notice | File in the district court for your county or the adoptee's (40-14-4), pay the docket fee the clerk confirms, and serve everyone listed in 40-14-9(A). File the consent and proof of service before the hearing. | - | At filing |
| Attend the hearing | Both of you attend unless excused for good cause (40-14-12(A)). Be ready to prove each allegation by clear and convincing evidence. The decree is to be entered within six months of filing (40-14-12(G)). | - | At least 30 days after filing |
| Submit the birth certificate application | Prepare an application for a birth certificate in the adoptee's new name showing you as the parent, and give it to the court clerk to forward (40-14-14(A)). | - | Within 30 days after the decree |
Frequently Asked Questions
Other New Mexico guides
Adult Guardianship in New Mexico
Adverse Possession in New Mexico: Ten Years, a Writing, and Every Tax Bill
Asset Protection Planning in New Mexico (2026)
Dealing With Debt Collectors in New Mexico (2026)
Delinquent Property Taxes in New Mexico: The State Sells the Parcel, and Nothing Buys It Back Afterward
Expunging a Criminal Record in New Mexico (2026)
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