In almost every case, both legal parents have to consent to an adoption before a court will finalize it. The right to parent is treated as fundamental, so a judge won’t approve the adoption until every person with legal parental status has either signed a voluntary consent or had their rights terminated in a court proceeding. The real question for most families isn’t whether both parents must agree in principle. It’s what happens when one parent can’t be located, refuses to sign, or has been out of the child’s life for years.
Who Counts as a Legal Parent
Consent rules apply to legal parents, and legal parent is a narrower category than biological parent. The birth mother is always a legal parent. So is a man who was married to the birth mother when the child was born or conceived, because the law presumes he is the father. A man who has established paternity through a court order or a formal acknowledgment is also a legal parent, and his consent is required.
Biology alone doesn’t create legal parentage. A man who fathered a child outside marriage and never took legal steps to establish paternity may not qualify as a legal parent at all. Whether his consent matters depends on what he did after learning about the child, and how quickly he did it.
When an Unmarried Father’s Consent Isn’t Required
An unmarried biological father doesn’t automatically stand on equal footing with the birth mother. Having his name on the birth certificate isn’t enough on its own. To secure the right to block or object to an adoption, he generally has to take affirmative steps to claim paternity.
About 33 states operate a putative father registry. A man who believes he may have fathered a child can file a formal notice of that claim with the registry, which entitles him to legal notice if an adoption petition is later filed for that child. That notice is what gives him the chance to appear in court and assert his rights.
The deadlines are short and strict. Some states allow only 30 days after the child’s birth to register. In many states, failing to register on time counts as an implied, irrevocable consent to any future adoption. Once that happens, the court can finalize the adoption based on the birth mother’s consent alone, and the biological father has no standing to object. State-imposed deadlines for filing a paternity action or providing support for prenatal and postnatal expenses can be as short as 15 to 30 days after birth.
Grounds a Court Uses to Waive the Other Parent’s Consent
When a legal parent won’t consent, the adoption can still go forward if the court terminates that parent’s rights involuntarily. This is a high bar. Judges don’t waive consent because they think the child would be better off with the adoptive family. The petitioner has to prove specific statutory grounds, generally by clear and convincing evidence.
Abandonment
Abandonment is the most common basis. A parent is treated as having abandoned a child when they fail to maintain meaningful contact or provide reasonable financial support for an extended period, commonly six months to one year depending on the state. Courts weigh both sides of the ledger. A parent who sends occasional birthday cards but pays nothing, or who sends money but never visits, can still be found to have abandoned the child.
Parental Unfitness
A court can also terminate rights on a finding that a parent is unfit. Common grounds include:
- Chronic abuse or neglect, meaning a documented pattern of physical, emotional, or sexual abuse, or persistent failure to meet the child’s basic needs.
- Long-term substance abuse that endangers the child, especially when court-ordered treatment has failed.
- Severe mental illness that leaves the parent unable to provide safe care, particularly when treatment hasn’t improved their capacity.
- Incarceration long enough that the parent cannot care for the child during critical developmental years.
- Serious felony convictions, especially crimes involving violence against a child or another family member.
Prior Termination
If a parent’s rights were already terminated in an earlier proceeding, often a child protective services case involving abuse or neglect, that parent’s consent isn’t needed. Authority to consent transfers to whatever agency or guardian the court has designated.
Unknown Whereabouts
When a parent cannot be found after a diligent search, a court can authorize service by publication, meaning a legal notice in a newspaper. If the parent doesn’t respond, the case can move forward without their consent, but the petitioner usually has to document the search efforts before a judge will approve this route.
Stepparent Adoptions
Stepparent adoption is where the two-parent consent rule bites hardest. When a stepparent wants to adopt a spouse’s child, the noncustodial biological parent has to consent or have their rights terminated. There is no shortcut.
Many of these cases involve a biological parent who has been absent for years. Courts can waive that parent’s consent if the family shows abandonment, typically evidenced by a lack of support and contact for a sustained period, often around one year. Some states also look at whether the absence reflected an intent to abandon the relationship rather than a temporary gap.
If the noncustodial parent actively objects, the case becomes contested. A mere objection doesn’t automatically fail even if the parent hasn’t been a model parent. Courts are reluctant to sever parental rights when a biological parent is fighting to keep them, so a contested stepparent adoption tends to be slower and harder than families expect. If no grounds for termination exist, the petition is denied and the biological parent’s legal relationship with the child continues.
Notice Rights of the Nonconsenting Parent
Waiving consent doesn’t mean skipping notice. Due process requires that any parent facing the loss of parental rights be formally notified and given the chance to appear in court. Both parents typically have to be served with the petition and summons. A parent who has been properly served and chooses not to appear can have their rights terminated in their absence, but a proceeding that skipped the notice step can be invalidated on appeal.
How Valid Consent Is Given
A parent’s agreement to an adoption has to be in a signed, written document that clearly states the parent is voluntarily giving up all parental rights. Verbal agreements have no legal effect.
States impose mandatory waiting periods before a birth mother can sign. The most common windows are 48 or 72 hours after birth. A few states allow signing as early as 24 hours after birth; others require longer. Any consent signed before the waiting period expires is invalid. The signing itself must be witnessed by a judge, notary, or other authorized official who can confirm the parent understood the document and wasn’t pressured into signing it.
Withdrawing Consent
Once a formal consent is signed, undoing it is difficult. Every state provides a revocation window, but the length varies widely, from just a few days in some states to about 30 days in others. Some states set no fixed window and instead require the parent to prove fraud or duress within a defined timeframe.
After the revocation window closes, the consent becomes irrevocable in most circumstances. A late withdrawal request forces the parent to prove that the consent was obtained through fraud, duress, or coercion, and even then the court weighs the child’s need for stability against the parent’s claim. Once a child has been placed with an adoptive family, judges are deeply reluctant to disrupt that placement.
Extra Protections for Native American Children
The Indian Child Welfare Act sets stricter consent rules when the child is a member of, or eligible for membership in, a federally recognized tribe. These federal rules override less protective state laws.
Under ICWA, parental consent to adoption is not valid unless all of the following are true:
- The consent is in writing.
- It is given before a judge, on the record.
- The judge certifies that the parent fully understood the terms and consequences.
- The court certifies that the explanation was given in English or interpreted into a language the parent understood.
- The consent was given more than ten days after the child’s birth. Any consent given before or within those ten days is automatically invalid.1Office of the Law Revision Counsel. 25 USC 1913 – Parental Rights; Voluntary Termination
Withdrawal rules under ICWA are also more protective. A parent of a Native American child can withdraw consent for any reason, at any time, up until the court enters a final adoption decree. Even after the decree, a parent can petition to vacate the adoption by showing the consent was obtained through fraud or duress, generally within two years unless state law allows longer.1Office of the Law Revision Counsel. 25 USC 1913 – Parental Rights; Voluntary Termination If the court finds fraud or duress, it must vacate the adoption and return the child to the parent.2eCFR. 25 CFR 23.136 – What Are the Requirements for Vacating an Adoption Based on Consent Having Been Obtained Through Fraud or Duress
When the Child’s Consent Is Also Required
Parents aren’t the only ones whose agreement can matter. Nearly every state requires the child’s own consent once they reach a certain age, most commonly 12 or 14. A few states set the threshold as low as 10. The child’s consent is typically given in writing or stated in open court. Courts can waive this if the child lacks capacity or if a judge finds that requiring consent wouldn’t serve the child’s best interests, but for a teenager capable of expressing a preference, a refusal can stop the adoption.