A Washington appeals court has confirmed that trial courts cannot order joint decision-making in a parenting plan when both parents have a history of domestic violence. In In re Marriage of Thiess, No. 87345-8-I (Wash. Ct. App. Jan. 26, 2026), Division One held that former RCW 26.09.191(1) prohibits mutual decision-making whenever at least one parent has a founded history of domestic violence — even when both parents have such findings. If you are going through a divorce or custody dispute in King County that involves domestic violence allegations, this ruling could directly affect how your parenting plan is structured.
What Did the Court Decide in Thiess?
The Court of Appeals reversed a trial court’s order requiring joint decision-making between two parents who had both been found to have committed domestic violence. The mother had a history of physical domestic violence, and the father had a history of emotional domestic violence as defined under RCW 7.105.010. Despite those findings, the trial court ordered joint decision-making, reasoning that restricting both parents did not make “common sense.”
Division One disagreed. The court held that former RCW 26.09.191(1) uses mandatory language — “shall not require mutual decision-making” — and that the statute applies when any parent has a history of domestic violence. The court remanded the case and ordered the trial court to assign sole decision-making authority to one parent.
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