Proving a Parent Is Mentally Unstable in Child Custody Cases

Trying to care for your child when their other parent is mentally unstable can be a harrowing experience. And parenting is even more challenging when you and a mentally unfit parent do not live under the same roof.

But, you can reduce this challenge by proving your child’s parent is mentally unstable and receiving a favorable custody order from a family court judge. To do this, you will likely need to present healthcare records, reports from healthcare and childcare professionals, and persuasive arguments to the court.

One of our seasoned and compassionate child custody attorneys at Summit Family Law can show you how to prove a parent is mentally unstable and help you win the custody orders that are necessary to protect your child.

We are here to stand in the gap and address your needs when you face stressful family legal situations, so call us for a consultation at (205) 519-3033 or use the contact form on the website.

 

Your Concerns About a Mentally Unstable Parent Are Valid

When a mentally unstable parent is alone with your child, we understand that you might worry about your child’s safety and the long-term effects of the exposure. Given the statistics, your concerns have merit.

A parent’s mental instability might be displayed through acts of domestic violence, a substance use disorder, or challenges associated with mental illness. And your child could bear the brunt of the harm if these displays of instability are not properly handled. The U.S. Department of Health & Human Services reports that children who witness violence in their homes may experience the following:

• Regressing to behaviors from their younger years, such as thumb-sucking, bed-wetting, and crying jags;
• Sleep difficulties;
• Trouble participating in school or maintaining good grades;
• Low self-esteem;
• Headaches;
• Depression;
• Engaging in risky behaviors, such as drug and alcohol use, unprotected sex, and fighting;
• Stomachaches;
• Anxiety;
• Difficulty making friends; and
• Getting in trouble with the law.

The Department of Health & Human Services also reports that boys who witness their mothers being abused are 10 times more likely to abuse female partners in adulthood, and girls in households where fathers abuse their mothers are over six times more likely to be survivors of sexual abuse.

Children of parents with poor mental health are more likely to struggle with their own poor mental and physical health as well as developmental disabilities. Furthermore, a child exposed to a parent with a substance use disorder is up to four times more likely to develop their own addiction. They are also more likely to develop mental or physical health issues and six times more likely to witness spousal abuse.

How Can the Law Intervene?

While Alabama family courts prefer to award joint custody, courts will restrict parenting time and parenting rights when they believe it is in the child’s best interest. And what is in the best interest of the child depends on the following factors:

• A parent’s history of or propensity for committing abuse or kidnapping,
• Each parent’s ability to encourage a close relationship between the child and the other parent,
• Where each parent lives,
• Each parent’s ability to cooperate with the other parent and make joint decisions, and
• Whether the parents agree to joint custody.

These factors come straight from Alabama’s joint-custody statute, Ala. Code § 30-3-152(a), and they sit alongside the court’s general authority to award custody as the child’s safety and well-being require under Ala. Code § 30-3-1. If custody was already decided and you are asking the court to change it, Alabama adds a higher hurdle: under Ex parte McLendon, 455 So. 2d 863 (Ala. 1984), the parent seeking the change must show the move would so materially promote the child’s best interests that it outweighs the disruption of uprooting the child.

The 2026 Change: HB 229’s Joint-Custody Presumption

For custody actions filed on or after January 1, 2026, Alabama law (HB 229, amending Ala. Code § 30-3-150 et seq.) starts from a rebuttable presumption that joint physical and legal custody serves the child’s best interests. The presumption can be rebutted by a preponderance of the evidence showing joint custody would not serve your child — and documented mental instability that affects parenting capacity is precisely the kind of specific evidence courts require. The new law raises the bar for vague concerns, not for well-documented ones. Our guide to child custody after HB 229 explains the presumption in detail.

Given the factors above, proving mental instability or proving mental illness in your child custody case may be enough to restrict the other parent’s contact with your child and protect your child from the effects of harmful parenting.

How to Prove a Parent Is Mentally Unstable

When determining how to prove mental illness in a custody case or mental instability in family court, you need to take a look at the specific details of your case. You might be able to use information you already have, or you might need new information to make your case.

Evidence you can use to prove the instability of your child’s other parent can include the following:

• Medical or mental health records,
• Your testimony,
• Documents from the other parent’s treatment for a substance use disorder,
• Records from a mental health evaluation,
• Testimony from a mental health or behavioral health professional,
• Police reports,
• Testimony from the other parent,
• Your child’s school records,
• Testimony from your child or anyone in the other parent’s household,
• The other spouse’s employment records,
• Copies of restraining orders, and
• Conviction records.

Another person’s instability is a complex and delicate issue. So enlisting the help of an experienced family law advocate is often the best way to approach this matter in legal proceedings.

What Courts Treat as “Mentally Unstable” — and What They Don’t

“Mentally unstable” is not a diagnosis — it is a description of behavior that puts a child at risk. Alabama judges focus on parenting capacity, not psychiatric labels. That distinction cuts both ways, so it helps to see examples on each side of the line.

Conduct that tends to show instability affecting parenting:

• Untreated episodes of psychosis, mania, or severe depression that leave a parent unable to safely supervise the child;
• Suicide threats or attempts, or self-harm, particularly in the child’s presence;
• Substance abuse that impairs caregiving — driving under the influence with the child in the car, passing out during parenting time, failed drug screens;
• Violent or explosive outbursts, documented domestic violence, or protection orders;
• Refusing prescribed treatment after a hospitalization while continuing high-risk behavior;
• Paranoid or delusional behavior directed at the child or the other parent — for example, threats to disappear with the child; and
• A home made unsafe by untreated illness — hoarding, no working utilities, no food, or unsecured weapons.

What is generally not enough, standing alone:

• A mental health diagnosis by itself — depression, anxiety, ADHD, bipolar disorder, or PTSD that is treated and managed does not make a parent unfit;
• Going to therapy or taking prescribed medication — courts view seeking treatment favorably, not as a strike against a parent;
• A resolved past episode, such as postpartum depression years ago;
• Ordinary grief, stress, or anger during a divorce;
• Different parenting styles, strictness, or religious differences; and
• Being difficult with you but consistently appropriate with the child.

Judges are careful here for good reason: roughly one in five adults experiences mental illness in a given year, and punishing parents for getting help would harm children rather than protect them. Your case is strongest when you connect specific conduct to specific risk to your child.

10 Practical Ways to Prove Mental Instability in an Alabama Custody Case

1. Ask the court to order a mental examination. Under Alabama Rule of Civil Procedure 35, when a parent’s mental condition is genuinely in controversy, the court can order an independent psychological examination — often the single most persuasive piece of evidence.
2. Request a custody evaluation or guardian ad litem. A court-appointed evaluator or guardian ad litem investigates both households and reports to the judge with recommendations.
3. Keep a contemporaneous incident journal. Date, time, what happened, who witnessed it. A pattern documented as it happens carries far more weight than memories reconstructed for trial.
4. Preserve texts, emails, voicemails, and social media. Threats, delusional accusations, middle-of-the-night tirades, and posts showing substance abuse are powerful evidence. Do not delete anything — and never log into the other parent’s accounts to get it.
5. Gather official records. Police reports, 911 call logs, protection orders, DUI and other conviction records, and DHR involvement create an objective paper trail.
6. Use medical and treatment records properly. When a parent’s fitness is at issue, mental health and substance abuse treatment records may become discoverable. Your attorney can subpoena them the right way rather than obtaining them improperly.
7. Collect school and childcare documentation. Missed pickups, unexplained absences, and teacher observations show how instability reaches the child’s daily life.
8. Line up witnesses. Neighbors, family members, coaches, and childcare providers who have seen concerning behavior firsthand can corroborate your testimony.
9. Retain the right experts. A treating provider or forensic psychologist can explain to the court what the records mean and how the condition affects parenting capacity.
10. Stay credible yourself. Follow court orders, keep written exchanges civil, and never coach your child. Judges weigh the stability of both parents — your documentation should show a contrast, not a contest.

Every one of these steps works best inside a strategy built for your county’s judges. Our child custody attorneys handle these cases across Alabama and can tell you which evidence will matter most in your situation.

Talk to Our Attorneys at Summit Family Law

At Summit Family Law, we are dedicated to helping parents in Alabama safely move forward from fractures in their family unit. We lead with compassion, and we have decades of combined experience. And our knowledge and hard work in the legal field have not gone unnoticed, as our attorneys are award-winning advocates.

If you need to know how to prove someone is unstable in court so that you can save your family, we can show you the way. Reach out to us online, or call us at (205) 519-3033 to schedule a no-obligation case evaluation.