Erika Bautista and her three daughters were inside a northbound 2015 Honda, which broke down in the right lane of County Route 83, when it was hit a 2018 Jeep being driven by Chris Montpetit.
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It happened just after 5 p.m. Friday.
Bautista, 31, of Farmingville, and her daughters, ages 4 and 8, were transported to Stony Brook University Hospital for treatment of serious injuries.
Bautista's 10-year-old daughter was treated for injuries said to be non-life-threatening.
Montpetit, 36, of Shirley, was arrested at the scene and will be charged with Driving While Intoxicated and other offenses.
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