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How Washington Courts Determine the Best Interests of the Child

by Darin | May 20, 2025 | Criminal Law

Imagine yourself sitting across from a family court judge, your heart racing, as decisions are being made about where your child will live, who will make important decisions in their life, and how much time they’ll spend with each parent. In this moment, nothing matters more than your child’s future. But how exactly does a Washington court decide what arrangement is best for your child?

The phrase “best interests of the child” gets mentioned frequently in custody cases, but understanding what it actually means can feel like deciphering a foreign language. As your family law attorney, I want to pull back the curtain on this critical standard that guides every custody decision in Washington State courts.

The Foundation: What Does “Best Interests of the Child” Really Mean?

In Washington State, the “best interests of the child” isn’t just a nice-sounding phrase—it’s the cornerstone of all custody decisions, formally embedded in state law. According to RCW 26.09.002, the standard acknowledges that “the best interests of the child are served by a parenting arrangement that best maintains a child’s emotional growth, health and stability, and physical care.”

This means courts aren’t focused on what’s fair to parents, but rather what arrangement will help your child flourish during and after your separation or divorce. Washington law recognizes the importance of maintaining relationships with both parents when possible, but only to the extent that those relationships support the child’s overall well-being.

The Seven Key Factors Courts Must Consider

Washington courts don’t decide custody arbitrarily. Instead, RCW 26.09.187 outlines seven specific factors that judges must weigh when determining parenting arrangements. Let’s break them down:

1. The Strength of Parent-Child Relationships

The law states that courts must consider “the relative strength, nature, and stability of the child’s relationship with each parent.” This factor is explicitly given “the greatest weight” of all the factors—making it the single most important consideration in custody decisions.

Courts assess the quality of emotional bonds, attachment patterns, and the history of care between each parent and child. They look for evidence of meaningful, consistent relationships rather than simply counting hours spent together.

2. Parents’ Agreements

Courts consider agreements between parents, provided they were “entered into knowingly and voluntarily.” This means if you and your co-parent can agree on a parenting plan, the court will generally approve it—as long as it meets other legal requirements and truly serves your child’s best interests.

This factor encourages parents to work together when possible, recognizing that cooperative solutions often produce better outcomes than court-imposed decisions.

3. Past and Future Parenting Performance

The court evaluates “each parent’s past and potential for future performance of parenting functions,” including which parent has historically taken greater responsibility for the daily needs of the child.

This factor looks at who has been handling day-to-day responsibilities like:

Preparing meals
Bathing and dressing
Healthcare appointments
School communications
Extracurricular activities

The court also considers each parent’s demonstrated ability to put the child’s needs first and provide consistent care.

4. Child’s Emotional Needs and Developmental Level

Children have different needs at different ages, and courts recognize this through consideration of “the emotional needs and developmental level of the child.”

A parenting plan for a toddler might emphasize consistency and shorter transitions, while a plan for a teenager might allow for more flexibility and input from the child. Courts look for arrangements that support age-appropriate development and emotional security.

5. Relationships with Siblings and Significant Others

The court considers “the child’s relationship with siblings and with other significant adults, as well as the child’s involvement with his or her physical surroundings, school, or other significant activities.”

This factor recognizes that children exist within a web of important relationships beyond just their parents. Courts generally try to preserve sibling relationships, maintain connections with extended family, and minimize disruption to the child’s education and community activities.

6. Wishes of Parents and Child

Courts consider “the wishes of the parents and the wishes of a child who is sufficiently mature to express reasoned and independent preferences as to his or her residential schedule.”

Unlike some states, Washington does not specify an age at which a child’s preference becomes determinative. Rather, the court assesses whether the child is mature enough to express thoughtful, independent views. Even then, a child’s wishes are just one factor among many.

7. Parents’ Work Schedules

Courts consider “each parent’s employment schedule” and make accommodations consistent with those schedules. This practical factor ensures that parenting plans align with parents’ work obligations.

While a demanding work schedule won’t disqualify a parent from significant time with their child, it is a reality that courts must account for when crafting workable parenting arrangements.

When the Court Must Limit Parenting Time: RCW 26.09.191

While Washington courts typically favor arrangements that allow children to maintain strong relationships with both parents, RCW 26.09.191 identifies circumstances where the court must restrict a parent’s time or decision-making authority.

Mandatory Limitations

The court must limit a parent’s residential time if it finds the parent has engaged in:

Willful abandonment that continues for an extended period
Physical, sexual, or a pattern of emotional abuse of the child
A history of domestic violence
Certain sex offense convictions

In these serious situations, the law prioritizes the child’s safety above all else, including the parent-child relationship.

Discretionary Limitations

The court may also limit a parent’s involvement when:

A parent has neglected or substantially failed to perform parenting functions
A parent has a long-term physical or emotional impairment that interferes with parenting
A parent struggles with substance abuse that impacts parenting ability
There’s an absence of emotional ties between parent and child
A parent uses conflict in ways harmful to the child’s psychological development
A parent has withheld the child from the other parent without good cause

These limitations aren’t meant to punish parents but to protect children from situations that could harm their development or safety.

How Courts Balance All These Factors

In practice, courts rarely make custody decisions based on a single factor. Instead, judges weigh all relevant factors to create a comprehensive parenting plan that addresses:

Where the child will live (residential schedule)
How major decisions will be made (decision-making authority)
How disputes between parents will be resolved
Any necessary restrictions or special provisions

Every family situation is unique, which is why Washington law gives judges significant discretion to craft parenting plans that address the specific circumstances of each case.

Common Misconceptions About Custody Decisions

Many parents enter the custody process with misconceptions that can lead to unnecessary stress and poor decision-making:

Myth 1: Mothers always get custody. Reality: Washington law is gender-neutral. The focus is on the child’s relationship with each parent and each parent’s history of providing care—not gender.

Myth 2: There’s a presumption of 50/50 custody. Reality: While Washington courts recognize the value of both parents’ involvement, there is no legal presumption of equal residential time. The court focuses on what arrangement best supports the child’s well-being, which may or may not be an equal split.

Myth 3: Children can choose which parent to live with once they reach a certain age. Reality: Washington doesn’t have a specific age at which children can choose their living arrangements. Rather, the court considers a child’s preferences as just one factor, and only if the child is mature enough to express reasoned, independent views.

Myth 4: The wealthier parent has an advantage. Reality: Financial resources may factor into a court’s assessment of a parent’s ability to provide for a child’s needs, but wealth alone doesn’t determine custody outcomes. The quality of the parent-child relationship carries much more weight.

Navigating the Court Process Successfully

When courts are determining your child’s best interests, preparation and understanding are key:

Document your involvement in your child’s life. Keep records of your participation in school events, medical appointments, and daily care activities.

Focus on cooperation when possible. Courts view parents who demonstrate a willingness to collaborate favorably.

Be realistic about your circumstances. Acknowledge any limitations in your situation and be prepared to address how you’ll manage them.

Consider professional evaluations. In complex cases, the court may appoint a Guardian ad Litem (GAL) or order parenting evaluations to gather more information about what would best serve the child.

Maintain perspective. Remember that the court process isn’t about winning or losing—it’s about creating an arrangement that helps your child thrive.

Key Takeaways

The “best interests of the child” standard focuses on what will support the child’s emotional, physical, and developmental well-being.
Washington courts consider seven specific factors outlined in RCW 26.09.187, with the parent-child relationship given the greatest weight.
Safety concerns can lead to limitations on parenting time under RCW 26.09.191.
There are no gender-based preferences or presumptions of 50/50 custody in Washington law.
Courts have significant discretion to craft parenting plans that address each family’s unique circumstances.
Cooperation between parents, when possible, often leads to better outcomes for children.

Frequently Asked Questions

How long does it take for a court to make a custody decision?

The timeline varies depending on court caseloads and the complexity of your situation. Simple cases might resolve in a few months, while contested cases can take a year or more.

Can a parenting plan be modified later?

Yes, but the standard for modification depends on how much time has passed and the nature of the requested changes. Minor modifications have a lower threshold, while major changes typically require showing a substantial change in circumstances.

What if my co-parent and I disagree about what’s best for our child?

Many courts require mediation before litigation. Working with a neutral third party often helps parents find common ground. If mediation doesn’t succeed, the court will make decisions based on evidence presented at trial.

Does my child have to testify in court?

Rarely. Courts typically shield children from direct participation in custody proceedings. Instead, if the child’s perspective is relevant, a GAL or parenting evaluator may speak with the child and report to the court.

How do courts handle relocation cases?

Washington has specific laws addressing relocation (RCW 26.09.405-560). The parent wishing to move must provide notice, and the other parent can object. The court then determines whether the relocation would be in the child’s best interests, considering eleven specific factors.

Can grandparents or other relatives seek custody or visitation?

Washington law allows nonparental custody petitions in certain circumstances, typically when parents are unfit or unwilling to care for a child. However, these cases face stringent legal standards that prioritize parents’ constitutional rights.