An 88-year-old patient with end-stage heart failure is admitted with pneumonia.
He has no advance directive and has lost decisional capacity.
His two adult children are in conflict: his son wants to pursue aggressive treatment, including intubation, while his daughter states the patient would have wanted comfort-focused care only.
The patient's wife is deceased.
According to the most common legal hierarchy for surrogate decision-making, who should the clinical team primarily consult?