PITTSFIELD TOWNSHIP, Mich. (WXYZ) - St. Joseph Hospital says that Dawn Siegel was discharged from the hospital Sunday.
Siegel is the step-mom who was driving the van.
Another passenger, Erica Fox, was discharged Saturday.
Police are searching for a mini van that is believed to be involved in a deadly rollover crash that killed a 14-year-old boy and 11-year-old sister on southbound US 23.
Jordan Siegel and Ashley Siegel were in a 1999 Ford Expedition that was being driven by their step-mom, Dawn Siegel, when the SUV was cut off by another vehicle.
Friends of the family tell 7 Action News that Dawn was driving her four children along with Jordan and Ashley to a friend's house in Ohio for the weekend. The children's father, Marc Siegel, was going to meet up with them after work.
Witnesses say Dawn Siegel attempted to avoid the other vehicle by swerving onto the shoulder of the median, but she lost control and the Expedition flipped several times. Both Jordan and Ashley were pronounced dead at the scene.
Dawn Siegel and the four surviving children were taken to area hospitals with various injuries.
Michigan State Police say they looking for a light gray or silver mini van with a paper license plate on the back in connection with the accident. The vehicle may have been a Honda Odyssey.
Officers say witnesses described the driver as an Arabic looking woman who may be around 40-years-old.
Anyone with information is asked to call the Michigan State Police Brighton Post at (810) 227-1051.