How Is Custody Decided in South Dakota? The Fuerstenberg Factors Explained
The Best-Interests Standard
South Dakota custody decisions are governed by SDCL § 25-4-45, which directs judges to award custody based on what best serves the child's "temporal, mental, and moral welfare." In practice, that means judges apply the structured framework established by the South Dakota Supreme Court in Fuerstenberg v. Fuerstenberg (1999 SD 35).
These factors aren't a checklist where you score points. The judge weighs them holistically, and no single factor automatically controls the outcome. But understanding what the court looks at — and what kind of evidence supports each factor — gives you a foundation for building your case.
Factor 1: Parental Fitness
The court evaluates each parent's ability to provide:
- Basic physical needs — food, clothing, shelter, and medical care
- Emotional support — love, affection, and guidance
- Age-appropriate discipline and structure
- A safe, stable environment free from harmful influences
Fitness includes mental and physical health. A serious untreated mental health condition or substance abuse problem can weigh heavily here, but only if it directly impacts the parent's ability to care for the child. A parent managing a condition with treatment and stability is evaluated differently from one who refuses help.
Factor 2: Home Stability and Continuity
Judges place significant weight on stability — disrupting a child's established routine carries real risk. The court considers:
- How long the child has lived in their current home
- The child's adjustment to their school and community
- Extended family relationships and support networks on both sides
- Whether one parent's living situation provides more consistency than the other's
If one parent has been the child's primary home base for years, a judge needs a strong reason to uproot that arrangement. This factor often favors maintaining the status quo, especially when the child is thriving.
Free Download
Get the South Dakota — Parenting Plan Starter Checklist
Everything in this article as a printable checklist — plus action plans and reference guides you can start using today.
Factor 3: Primary Caretaker History
Which parent has historically done the day-to-day work of raising the child? The court looks at practical indicators:
- Who prepares meals and manages bedtime routines
- Who handles medical appointments, selects clothing, and bathes the child
- Who attends parent-teacher conferences, helps with homework, and coordinates extracurriculars
- Who knows the child's pediatrician, teachers, and close friends by name
This factor carries the most weight for younger children who depend heavily on routine and primary attachment. As children grow older and more independent, the court may shift emphasis toward which parent offers stronger guidance and preparation for adulthood.
Factor 4: Sibling Unity
South Dakota courts operate under a strong presumption that siblings — including half-siblings — should stay together. Splitting children between parents requires extraordinary circumstances and compelling evidence that separation is in each individual child's best interest.
If you have multiple children and want them to remain together, this factor works in your favor as long as the court sees a stable, unified household.
Factor 5: The Child's Preference
Under SDCL § 25-4-45, a judge may consider the child's stated preference if the child is of sufficient age and maturity to form an "intelligent" opinion. There's no statutory minimum age — it's left to the judge's discretion.
In practice, judges typically give meaningful weight to the preferences of children age 12 and older. But the child's reasoning matters as much as the preference itself. A thoughtful explanation about feeling more comfortable at one parent's home carries more weight than "Dad lets me stay up late." And judges are trained to identify preferences that have been coached or pressured by a parent.
The court may consider the child's preference, but the child does not make the custody decision.
Factor 6: The Friendly Parent Factor
The court assesses each parent's willingness to support and encourage the child's relationship with the other parent. A parent who:
- Badmouths the other parent to the child
- Interferes with scheduled parenting time
- Blocks phone calls or video chats
- Uses the child as a messenger or spy
is at a serious disadvantage. Judges view cooperative co-parenting as central to a child's well-being, and a parent who demonstrates they can facilitate — not undermine — the other parent's relationship with the child earns credibility.
Factor 7: Harmful Misconduct and Domestic Violence
Under SDCL § 25-4-45.1, general marital fault — an affair, for example — is excluded from custody analysis unless the parent's behavior directly harms the child.
Domestic violence is treated differently. Under SDCL § 25-4-45.5, the court must consider any history of domestic abuse or assault convictions. A documented pattern of abuse creates a rebuttable presumption under SDCL § 25-4A-22 that awarding custody to the abusive parent is not in the child's best interests.
Documenting Your Case
Each Fuerstenberg factor is strengthened by evidence, not assertions. School records, medical visit logs, communication records, photos of the home environment, and third-party testimony from teachers, coaches, or therapists all carry weight. The South Dakota Child Custody & Parenting Plan Guide includes an evidence organizer structured around these exact factors — so you can build your case systematically instead of scrambling to pull records together at the last minute.
Get Your Free South Dakota — Parenting Plan Starter Checklist
Download the South Dakota — Parenting Plan Starter Checklist — a printable guide with checklists, scripts, and action plans you can start using today.